55761639 has 4 divisors (see below), whose sum is σ = 74348856. Its totient is φ = 37174424.

The previous prime is 55761631. The next prime is 55761661. The reversal of 55761639 is 93616755.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55761639 - 2³ = 55761631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55761639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55761631) 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, 9293604 + ... + 9293609.

It is an arithmetic number, because the mean of its divisors is an integer number (18587214).

Almost surely, 2^55761639 is an apocalyptic number.

55761639 is a deficient number, since it is larger than the sum of its proper divisors (18587217).

55761639 is a wasteful number, since it uses less digits than its factorization.

55761639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18587216.

The product of its digits is 170100, while the sum is 42.

The square root of 55761639 is about 7467.3716259471. The cubic root of 55761639 is about 382.0426452943.

The spelling of 55761639 in words is "fifty-five million, seven hundred sixty-one thousand, six hundred thirty-nine".