56550399 has 32 divisors (see below), whose sum is σ = 81269760. Its totient is φ = 34898688.

The previous prime is 56550367. The next prime is 56550401. The reversal of 56550399 is 99305565.

It is a Cunningham number, because it is equal to 7520²-1.

It is not a de Polignac number, because 56550399 - 2⁵ = 56550367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56550399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56550349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 518757 + ... + 518865.

It is an arithmetic number, because the mean of its divisors is an integer number (2539680).

Almost surely, 2^56550399 is an apocalyptic number.

56550399 is a deficient number, since it is larger than the sum of its proper divisors (24719361).

56550399 is a wasteful number, since it uses less digits than its factorization.

56550399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 182250, while the sum is 42.

The square root of 56550399 is about 7519.9999335106. Note that the first 4 decimals coincide. The cubic root of 56550399 is about 383.8355754929.

The spelling of 56550399 in words is "fifty-six million, five hundred fifty thousand, three hundred ninety-nine".