70689920 has 128 divisors (see below), whose sum is σ = 199756800. Its totient is φ = 23408640.

The previous prime is 70689919. The next prime is 70689959. The reversal of 70689920 is 2998607.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138626 + ... + 139134.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^70689920 is an apocalyptic number.

70689920 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 70689920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99878400).

70689920 is an abundant number, since it is smaller than the sum of its proper divisors (129066880).

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

70689920 is a wasteful number, since it uses less digits than its factorization.

70689920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 70689920 is about 8407.7297768185. The cubic root of 70689920 is about 413.4780855016.

The spelling of 70689920 in words is "seventy million, six hundred eighty-nine thousand, nine hundred twenty".