70890391 has 32 divisors (see below), whose sum is σ = 89280576. Its totient is φ = 55756800.

The previous prime is 70890361. The next prime is 70890401. The reversal of 70890391 is 19309807.

It is not a de Polignac number, because 70890391 - 2⁷ = 70890263 is a prime.

It is a super-2 number, since 2×70890391² = 10050895072265762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 70890391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70890361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294031 + ... + 294271.

It is an arithmetic number, because the mean of its divisors is an integer number (2790018).

Almost surely, 2^70890391 is an apocalyptic number.

70890391 is a deficient number, since it is larger than the sum of its proper divisors (18390185).

70890391 is a wasteful number, since it uses less digits than its factorization.

70890391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 70890391 is about 8419.6431634601. The cubic root of 70890391 is about 413.8685802693.

The spelling of 70890391 in words is "seventy million, eight hundred ninety thousand, three hundred ninety-one".