55271778 has 16 divisors (see below), whose sum is σ = 110617920. Its totient is φ = 18411536.

The previous prime is 55271773. The next prime is 55271807. The reversal of 55271778 is 87717255.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55271773) 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, 13003 + ... + 16721.

It is an arithmetic number, because the mean of its divisors is an integer number (6913620).

Almost surely, 2^55271778 is an apocalyptic number.

55271778 is an abundant number, since it is smaller than the sum of its proper divisors (55346142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55271778 is a wasteful number, since it uses less digits than its factorization.

55271778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201.

The product of its digits is 137200, while the sum is 42.

The square root of 55271778 is about 7434.4991761382. The cubic root of 55271778 is about 380.9206164135.

The spelling of 55271778 in words is "fifty-five million, two hundred seventy-one thousand, seven hundred seventy-eight".