55688639 has 8 divisors (see below), whose sum is σ = 58746240. Its totient is φ = 52643736.

The previous prime is 55688629. The next prime is 55688641. The reversal of 55688639 is 93688655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55688639 - 2⁸ = 55688383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55688609) 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, 6644 + ... + 12470.

It is an arithmetic number, because the mean of its divisors is an integer number (7343280).

Almost surely, 2^55688639 is an apocalyptic number.

55688639 is a deficient number, since it is larger than the sum of its proper divisors (3057601).

55688639 is a wasteful number, since it uses less digits than its factorization.

55688639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6349.

The product of its digits is 1555200, while the sum is 50.

The square root of 55688639 is about 7462.4820937809. The cubic root of 55688639 is about 381.8758562451.

The spelling of 55688639 in words is "fifty-five million, six hundred eighty-eight thousand, six hundred thirty-nine".