55087657 has 2 divisors, whose sum is σ = 55087658. Its totient is φ = 55087656.

The previous prime is 55087649. The next prime is 55087699. The reversal of 55087657 is 75678055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 90601 = 7416^2 + 301^2 .

It is a cyclic number.

It is not a de Polignac number, because 55087657 - 2³ = 55087649 is a prime.

It is not a weakly prime, because it can be changed into another prime (55087607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27543828 + 27543829.

It is an arithmetic number, because the mean of its divisors is an integer number (27543829).

Almost surely, 2^55087657 is an apocalyptic number.

It is an amenable number.

55087657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55087657 is an equidigital number, since it uses as much as digits as its factorization.

55087657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 43.

The square root of 55087657 is about 7422.1059679851. The cubic root of 55087657 is about 380.4971724179.

The spelling of 55087657 in words is "fifty-five million, eighty-seven thousand, six hundred fifty-seven".