90725906 has 16 divisors (see below), whose sum is σ = 146248416. Its totient is φ = 42056256.

The previous prime is 90725903. The next prime is 90725911. The reversal of 90725906 is 60952709.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90725906.

It is not an unprimeable number, because it can be changed into a prime (90725903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17636 + ... + 22191.

It is an arithmetic number, because the mean of its divisors is an integer number (9140526).

Almost surely, 2^90725906 is an apocalyptic number.

90725906 is a deficient number, since it is larger than the sum of its proper divisors (55522510).

90725906 is a wasteful number, since it uses less digits than its factorization.

90725906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39913.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 90725906 is about 9525.0147506447. The cubic root of 90725906 is about 449.3420937447.

The spelling of 90725906 in words is "ninety million, seven hundred twenty-five thousand, nine hundred six".