70661000 has 64 divisors (see below), whose sum is σ = 174096000. Its totient is φ = 26769600.

The previous prime is 70660979. The next prime is 70661021. The reversal of 70661000 is 16607.

It is an interprime number because it is at equal distance from previous prime (70660979) and next prime (70661021).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17141 + ... + 20859.

It is an arithmetic number, because the mean of its divisors is an integer number (2720250).

Almost surely, 2^70661000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70661000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87048000).

70661000 is an abundant number, since it is smaller than the sum of its proper divisors (103435000).

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

70661000 is a wasteful number, since it uses less digits than its factorization.

70661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759 (or 3745 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 70661000 is about 8406.0097549313. The cubic root of 70661000 is about 413.4216917126.

Adding to 70661000 its reverse (16607), we get a palindrome (70677607).

The spelling of 70661000 in words is "seventy million, six hundred sixty-one thousand".