70391720 has 64 divisors (see below), whose sum is σ = 184118400. Its totient is φ = 23719680.

The previous prime is 70391689. The next prime is 70391749. The reversal of 70391720 is 2719307.

It is a happy 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, 14390 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (2876850).

Almost surely, 2^70391720 is an apocalyptic number.

70391720 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 70391720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92059200).

70391720 is an abundant number, since it is smaller than the sum of its proper divisors (113726680).

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

70391720 is a wasteful number, since it uses less digits than its factorization.

70391720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338 (or 4334 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 70391720 is about 8389.9773539623. The cubic root of 70391720 is about 412.8958575188.

The spelling of 70391720 in words is "seventy million, three hundred ninety-one thousand, seven hundred twenty".