55288387 has 32 divisors (see below), whose sum is σ = 71424000. Its totient is φ = 41558400.

The previous prime is 55288379. The next prime is 55288391. The reversal of 55288387 is 78388255.

It is a cyclic number.

It is not a de Polignac number, because 55288387 - 2³ = 55288379 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55288327) 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, 370989 + ... + 371137.

It is an arithmetic number, because the mean of its divisors is an integer number (2232000).

Almost surely, 2^55288387 is an apocalyptic number.

55288387 is a deficient number, since it is larger than the sum of its proper divisors (16135613).

55288387 is a wasteful number, since it uses less digits than its factorization.

55288387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its digits is 537600, while the sum is 46.

The square root of 55288387 is about 7435.6161143513. The cubic root of 55288387 is about 380.9587677518.

The spelling of 55288387 in words is "fifty-five million, two hundred eighty-eight thousand, three hundred eighty-seven".