70721504 has 144 divisors (see below), whose sum is σ = 176849568. Its totient is φ = 27675648.

The previous prime is 70721491. The next prime is 70721507. The reversal of 70721504 is 40512707.

It is a super-2 number, since 2×70721504² = 10003062256044032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1334342 + ... + 1334394.

It is an arithmetic number, because the mean of its divisors is an integer number (1228122).

Almost surely, 2^70721504 is an apocalyptic number.

70721504 is a gapful number since it is divisible by the number (74) 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 70721504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88424784).

70721504 is an abundant number, since it is smaller than the sum of its proper divisors (106128064).

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

70721504 is a wasteful number, since it uses less digits than its factorization.

70721504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 70721504 is about 8409.6078386569. The cubic root of 70721504 is about 413.5396565025.

The spelling of 70721504 in words is "seventy million, seven hundred twenty-one thousand, five hundred four".