890256557 has 4 divisors (see below), whose sum is σ = 890458080. Its totient is φ = 890055036.

The previous prime is 890256517. The next prime is 890256569. The reversal of 890256557 is 755652098.

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, and also an emirpimes, since its reverse is a distinct semiprime: 755652098 = 2 ⋅377826049.

It is a cyclic number.

It is not a de Polignac number, because 890256557 - 2²⁰ = 889207981 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 (890256517) 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, 93983 + ... + 103020.

It is an arithmetic number, because the mean of its divisors is an integer number (222614520).

Almost surely, 2^890256557 is an apocalyptic number.

It is an amenable number.

890256557 is a deficient number, since it is larger than the sum of its proper divisors (201523).

890256557 is a wasteful number, since it uses less digits than its factorization.

890256557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201522.

The product of its (nonzero) digits is 756000, while the sum is 47.

The square root of 890256557 is about 29837.1673756072. The cubic root of 890256557 is about 961.9925905265.

The spelling of 890256557 in words is "eight hundred ninety million, two hundred fifty-six thousand, five hundred fifty-seven".