55641578 has 16 divisors (see below), whose sum is σ = 88590024. Its totient is φ = 26119680.

The previous prime is 55641571. The next prime is 55641583. The reversal of 55641578 is 87514655.

It can be written as a sum of positive squares in 4 ways, for example, as 53772889 + 1868689 = 7333^2 + 1367^2 .

It is not an unprimeable number, because it can be changed into a prime (55641571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13748 + ... + 17328.

Almost surely, 2^55641578 is an apocalyptic number.

55641578 is a deficient number, since it is larger than the sum of its proper divisors (32948446).

55641578 is a wasteful number, since it uses less digits than its factorization.

55641578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057.

The product of its digits is 168000, while the sum is 41.

The square root of 55641578 is about 7459.3282539382. The cubic root of 55641578 is about 381.7682548577.

The spelling of 55641578 in words is "fifty-five million, six hundred forty-one thousand, five hundred seventy-eight".