56387855 has 4 divisors (see below), whose sum is σ = 67665432. Its totient is φ = 45110280.

The previous prime is 56387831. The next prime is 56387857. The reversal of 56387855 is 55878365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55878365 = 5 ⋅11175673.

It is a de Polignac number, because none of the positive numbers 2^k-56387855 is a prime.

It is a super-3 number, since 3×56387855³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56387857) 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, 5638781 + ... + 5638790.

It is an arithmetic number, because the mean of its divisors is an integer number (16916358).

Almost surely, 2^56387855 is an apocalyptic number.

56387855 is a deficient number, since it is larger than the sum of its proper divisors (11277577).

56387855 is a wasteful number, since it uses less digits than its factorization.

56387855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11277576.

The product of its digits is 1008000, while the sum is 47.

The square root of 56387855 is about 7509.1847094075. The cubic root of 56387855 is about 383.4674670269.

The spelling of 56387855 in words is "fifty-six million, three hundred eighty-seven thousand, eight hundred fifty-five".