70813920 has 96 divisors (see below), whose sum is σ = 230307840. Its totient is φ = 18270720.

The previous prime is 70813903. The next prime is 70813943. The reversal of 70813920 is 2931807.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×70813920² = 10029222531532800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 12501 + ... + 17259.

It is an arithmetic number, because the mean of its divisors is an integer number (2399040).

Almost surely, 2^70813920 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 70813920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115153920).

70813920 is an abundant number, since it is smaller than the sum of its proper divisors (159493920).

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

70813920 is a wasteful number, since it uses less digits than its factorization.

70813920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808 (or 4800 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 70813920 is about 8415.1007124098. The cubic root of 70813920 is about 413.7197103933.

The spelling of 70813920 in words is "seventy million, eight hundred thirteen thousand, nine hundred twenty".