70890087 has 24 divisors (see below), whose sum is σ = 99395328. Its totient is φ = 44930160.

The previous prime is 70890073. The next prime is 70890091. The reversal of 70890087 is 78009807.

It is not a de Polignac number, because 70890087 - 2⁶ = 70890023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70890047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192978 + ... + 193344.

It is an arithmetic number, because the mean of its divisors is an integer number (4141472).

Almost surely, 2^70890087 is an apocalyptic number.

70890087 is a deficient number, since it is larger than the sum of its proper divisors (28505241).

70890087 is a wasteful number, since it uses less digits than its factorization.

70890087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 70890087 is about 8419.6251104191. The cubic root of 70890087 is about 413.8679886695.

The spelling of 70890087 in words is "seventy million, eight hundred ninety thousand, eighty-seven".