70990805 has 4 divisors (see below), whose sum is σ = 85188972. Its totient is φ = 56792640.

The previous prime is 70990789. The next prime is 70990817. The reversal of 70990805 is 50809907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50809907 = 509 ⋅99823.

It can be written as a sum of positive squares in 2 ways, for example, as 49885969 + 21104836 = 7063^2 + 4594^2 .

It is not a de Polignac number, because 70990805 - 2⁴ = 70990789 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, 7099076 + ... + 7099085.

It is an arithmetic number, because the mean of its divisors is an integer number (21297243).

Almost surely, 2^70990805 is an apocalyptic number.

It is an amenable number.

70990805 is a deficient number, since it is larger than the sum of its proper divisors (14198167).

70990805 is a wasteful number, since it uses less digits than its factorization.

70990805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14198166.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 70990805 is about 8425.6041326424. The cubic root of 70990805 is about 414.0638986686.

The spelling of 70990805 in words is "seventy million, nine hundred ninety thousand, eight hundred five".