55309972 has 6 divisors (see below), whose sum is σ = 96792458. Its totient is φ = 27654984.

The previous prime is 55309957. The next prime is 55309973. The reversal of 55309972 is 27990355.

It can be written as a sum of positive squares in only one way, i.e., 55294096 + 15876 = 7436^2 + 126^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55309973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6913743 + ... + 6913750.

Almost surely, 2^55309972 is an apocalyptic number.

It is an amenable number.

55309972 is a deficient number, since it is larger than the sum of its proper divisors (41482486).

55309972 is a wasteful number, since it uses less digits than its factorization.

55309972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13827497 (or 13827495 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 55309972 is about 7437.0674327990. The cubic root of 55309972 is about 381.0083376861.

The spelling of 55309972 in words is "fifty-five million, three hundred nine thousand, nine hundred seventy-two".