90804021 has 64 divisors (see below), whose sum is σ = 168376320. Its totient is φ = 42024960.

The previous prime is 90804013. The next prime is 90804029. The reversal of 90804021 is 12040809.

It is an interprime number because it is at equal distance from previous prime (90804013) and next prime (90804029).

It is not a de Polignac number, because 90804021 - 2³ = 90804013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90803982 and 90804000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90804029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74005 + ... + 75221.

It is an arithmetic number, because the mean of its divisors is an integer number (2630880).

Almost surely, 2^90804021 is an apocalyptic number.

It is an amenable number.

90804021 is a deficient number, since it is larger than the sum of its proper divisors (77572299).

90804021 is a wasteful number, since it uses less digits than its factorization.

90804021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 90804021 is about 9529.1143869722. The cubic root of 90804021 is about 449.4710179231.

The spelling of 90804021 in words is "ninety million, eight hundred four thousand, twenty-one".