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70091840 = 2657132983
BaseRepresentation
bin1000010110110…
…00010001000000
311212220000221002
410023120101000
5120420414330
610542151132
71510525250
oct413302100
9155800832
1070091840
1136624045
121b5824a8
13116a1580
149447960
156247e45
hex42d8440

70091840 has 224 divisors, whose sum is σ = 215066880. Its totient is φ = 21159936.

The previous prime is 70091831. The next prime is 70091851. The reversal of 70091840 is 4819007.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 844439 + ... + 844521.

It is an arithmetic number, because the mean of its divisors is an integer number (960120).

Almost surely, 270091840 is an apocalyptic number.

70091840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70091840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107533440).

70091840 is an abundant number, since it is smaller than the sum of its proper divisors (144975040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70091840 is a wasteful number, since it uses less digits than its factorization.

70091840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 70091840 is about 8372.0869560702. The cubic root of 70091840 is about 412.3086887582.

The spelling of 70091840 in words is "seventy million, ninety-one thousand, eight hundred forty".