55139776 has 14 divisors (see below), whose sum is σ = 109418120. Its totient is φ = 27569856.

The previous prime is 55139743. The next prime is 55139779. The reversal of 55139776 is 67793155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430716 + ... + 430843.

It is an arithmetic number, because the mean of its divisors is an integer number (7815580).

Almost surely, 2^55139776 is an apocalyptic number.

It is an amenable number.

55139776 is a deficient number, since it is larger than the sum of its proper divisors (54278344).

55139776 is an equidigital number, since it uses as much as digits as its factorization.

55139776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861571 (or 861561 counting only the distinct ones).

The product of its digits is 198450, while the sum is 43.

The square root of 55139776 is about 7425.6162033868. The cubic root of 55139776 is about 380.6171320262.

The spelling of 55139776 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred seventy-six".