90455557 has 4 divisors (see below), whose sum is σ = 90477216. Its totient is φ = 90433900.

The previous prime is 90455549. The next prime is 90455569. The reversal of 90455557 is 75555409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90455557 - 2³ = 90455549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90455537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2353 + ... + 13654.

It is an arithmetic number, because the mean of its divisors is an integer number (22619304).

Almost surely, 2^90455557 is an apocalyptic number.

It is an amenable number.

90455557 is a deficient number, since it is larger than the sum of its proper divisors (21659).

90455557 is a wasteful number, since it uses less digits than its factorization.

90455557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21658.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 90455557 is about 9510.8126361526. The cubic root of 90455557 is about 448.8953266481.

The spelling of 90455557 in words is "ninety million, four hundred fifty-five thousand, five hundred fifty-seven".