90910025 has 6 divisors (see below), whose sum is σ = 112728462. Its totient is φ = 72728000.

The previous prime is 90910013. The next prime is 90910037. The reversal of 90910025 is 52001909.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90910013) and next prime (90910037).

It can be written as a sum of positive squares in 3 ways, for example, as 3655744 + 87254281 = 1912^2 + 9341^2 .

It is not a de Polignac number, because 90910025 - 2⁴ = 90910009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90909976 and 90910003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1818176 + ... + 1818225.

It is an arithmetic number, because the mean of its divisors is an integer number (18788077).

Almost surely, 2^90910025 is an apocalyptic number.

It is an amenable number.

90910025 is a deficient number, since it is larger than the sum of its proper divisors (21818437).

90910025 is a wasteful number, since it uses less digits than its factorization.

90910025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636411 (or 3636406 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 90910025 is about 9534.6748764706. The cubic root of 90910025 is about 449.6458530491.

The spelling of 90910025 in words is "ninety million, nine hundred ten thousand, twenty-five".