55624645 has 4 divisors (see below), whose sum is σ = 66749580. Its totient is φ = 44499712.

The previous prime is 55624643. The next prime is 55624651. The reversal of 55624645 is 54642655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54642655 = 5 ⋅10928531.

It can be written as a sum of positive squares in 2 ways, for example, as 43797924 + 11826721 = 6618^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 55624645 - 2¹ = 55624643 is a prime.

It is a super-2 number, since 2×55624645² = 6188202262752050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55624643) 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, 5562460 + ... + 5562469.

It is an arithmetic number, because the mean of its divisors is an integer number (16687395).

Almost surely, 2^55624645 is an apocalyptic number.

It is an amenable number.

55624645 is a deficient number, since it is larger than the sum of its proper divisors (11124935).

55624645 is a wasteful number, since it uses less digits than its factorization.

55624645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11124934.

The product of its digits is 144000, while the sum is 37.

The square root of 55624645 is about 7458.1931457961. The cubic root of 55624645 is about 381.7295240024.

The spelling of 55624645 in words is "fifty-five million, six hundred twenty-four thousand, six hundred forty-five".