70899521 has 24 divisors (see below), whose sum is σ = 90561600. Its totient is φ = 54885600.

The previous prime is 70899509. The next prime is 70899527. The reversal of 70899521 is 12599807.

It is not a de Polignac number, because 70899521 - 2⁶ = 70899457 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70899527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106931 + ... + 107591.

It is an arithmetic number, because the mean of its divisors is an integer number (3773400).

Almost surely, 2^70899521 is an apocalyptic number.

It is an amenable number.

70899521 is a deficient number, since it is larger than the sum of its proper divisors (19662079).

70899521 is a wasteful number, since it uses less digits than its factorization.

70899521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 70899521 is about 8420.1853305019. The cubic root of 70899521 is about 413.8863469364.

The spelling of 70899521 in words is "seventy million, eight hundred ninety-nine thousand, five hundred twenty-one".