70090906 has 4 divisors (see below), whose sum is σ = 105136362. Its totient is φ = 35045452.

The previous prime is 70090861. The next prime is 70090921. The reversal of 70090906 is 60909007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60909007 = 1487 ⋅40961.

It can be written as a sum of positive squares in only one way, i.e., 53890281 + 16200625 = 7341^2 + 4025^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17522725 + ... + 17522728.

Almost surely, 2^70090906 is an apocalyptic number.

70090906 is a deficient number, since it is larger than the sum of its proper divisors (35045456).

70090906 is a wasteful number, since it uses less digits than its factorization.

70090906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35045455.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 70090906 is about 8372.0311752883. The cubic root of 70090906 is about 412.3068573608.

The spelling of 70090906 in words is "seventy million, ninety thousand, nine hundred six".