70745920 has 56 divisors (see below), whose sum is σ = 192536064. Its totient is φ = 24254976.

The previous prime is 70745881. The next prime is 70745921. The reversal of 70745920 is 2954707.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70745921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13552 + ... + 18031.

It is an arithmetic number, because the mean of its divisors is an integer number (3438144).

Almost surely, 2^70745920 is an apocalyptic number.

70745920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70745920 is an abundant number, since it is smaller than the sum of its proper divisors (121790144).

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

70745920 is a wasteful number, since it uses less digits than its factorization.

70745920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31607 (or 31597 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 70745920 is about 8411.0593863080. The cubic root of 70745920 is about 413.5872413809.

The spelling of 70745920 in words is "seventy million, seven hundred forty-five thousand, nine hundred twenty".