55972645 has 4 divisors (see below), whose sum is σ = 67167180. Its totient is φ = 44778112.

The previous prime is 55972643. The next prime is 55972649. The reversal of 55972645 is 54627955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54627955 = 5 ⋅10925591.

It can be written as a sum of positive squares in 2 ways, for example, as 29408929 + 26563716 = 5423^2 + 5154^2 .

It is a cyclic number.

It is not a de Polignac number, because 55972645 - 2¹ = 55972643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55972643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5597260 + ... + 5597269.

It is an arithmetic number, because the mean of its divisors is an integer number (16791795).

Almost surely, 2^55972645 is an apocalyptic number.

It is an amenable number.

55972645 is a deficient number, since it is larger than the sum of its proper divisors (11194535).

55972645 is a wasteful number, since it uses less digits than its factorization.

55972645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11194534.

The product of its digits is 378000, while the sum is 43.

The square root of 55972645 is about 7481.4868174715. The cubic root of 55972645 is about 382.5239308934.

The spelling of 55972645 in words is "fifty-five million, nine hundred seventy-two thousand, six hundred forty-five".