55720687 has 8 divisors (see below), whose sum is σ = 62882640. Its totient is φ = 48908160.

The previous prime is 55720657. The next prime is 55720703. The reversal of 55720687 is 78602755.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55720687 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 (55720627) 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, 87018 + ... + 87655.

It is an arithmetic number, because the mean of its divisors is an integer number (7860330).

Almost surely, 2^55720687 is an apocalyptic number.

55720687 is a deficient number, since it is larger than the sum of its proper divisors (7161953).

55720687 is a wasteful number, since it uses less digits than its factorization.

55720687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174713.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 55720687 is about 7464.6290597725. The cubic root of 55720687 is about 381.9490968602.

The spelling of 55720687 in words is "fifty-five million, seven hundred twenty thousand, six hundred eighty-seven".