70809915 has 32 divisors (see below), whose sum is σ = 124330752. Its totient is φ = 34128000.

The previous prime is 70809899. The next prime is 70809929. The reversal of 70809915 is 51990807.

It is a happy number.

It is not a de Polignac number, because 70809915 - 2⁴ = 70809899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28680 + ... + 31050.

It is an arithmetic number, because the mean of its divisors is an integer number (3885336).

Almost surely, 2^70809915 is an apocalyptic number.

70809915 is a deficient number, since it is larger than the sum of its proper divisors (53520837).

70809915 is a wasteful number, since it uses less digits than its factorization.

70809915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 70809915 is about 8414.8627439787. The cubic root of 70809915 is about 413.7119107089.

The spelling of 70809915 in words is "seventy million, eight hundred nine thousand, nine hundred fifteen".