70431920 has 40 divisors (see below), whose sum is σ = 176353296. Its totient is φ = 26005248.

The previous prime is 70431919. The next prime is 70431931. The reversal of 70431920 is 2913407.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 70431920.

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 7 ways as a sum of consecutive naturals, for example, 32822 + ... + 34901.

Almost surely, 2^70431920 is an apocalyptic number.

It is an amenable number.

70431920 is an abundant number, since it is smaller than the sum of its proper divisors (105921376).

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

70431920 is a wasteful number, since it uses less digits than its factorization.

70431920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67749 (or 67743 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 70431920 is about 8392.3727276617. The cubic root of 70431920 is about 412.9744427783.

The spelling of 70431920 in words is "seventy million, four hundred thirty-one thousand, nine hundred twenty".