70890815 has 4 divisors (see below), whose sum is σ = 85068984. Its totient is φ = 56712648.

The previous prime is 70890793. The next prime is 70890823. The reversal of 70890815 is 51809807.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70890815 - 2²⁶ = 3781951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7089077 + ... + 7089086.

It is an arithmetic number, because the mean of its divisors is an integer number (21267246).

Almost surely, 2^70890815 is an apocalyptic number.

70890815 is a deficient number, since it is larger than the sum of its proper divisors (14178169).

70890815 is a wasteful number, since it uses less digits than its factorization.

70890815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14178168.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 70890815 is about 8419.6683426368. The cubic root of 70890815 is about 413.8694053925.

The spelling of 70890815 in words is "seventy million, eight hundred ninety thousand, eight hundred fifteen".