55387810 has 32 divisors (see below), whose sum is σ = 101896704. Its totient is φ = 21672000.

The previous prime is 55387799. The next prime is 55387811. The reversal of 55387810 is 1878355.

It is a super-2 number, since 2×55387810² = 6135618993192200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55387810.

It is not an unprimeable number, because it can be changed into a prime (55387811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128295 + ... + 128725.

It is an arithmetic number, because the mean of its divisors is an integer number (3184272).

Almost surely, 2^55387810 is an apocalyptic number.

55387810 is a deficient number, since it is larger than the sum of its proper divisors (46508894).

55387810 is a wasteful number, since it uses less digits than its factorization.

55387810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55387810 is about 7442.2987040296. The cubic root of 55387810 is about 381.1869855541.

The spelling of 55387810 in words is "fifty-five million, three hundred eighty-seven thousand, eight hundred ten".