55708521 has 36 divisors (see below), whose sum is σ = 84594384. Its totient is φ = 32580240.

The previous prime is 55708501. The next prime is 55708529. The reversal of 55708521 is 12580755.

It is a happy number.

It is not a de Polignac number, because 55708521 - 2¹⁰ = 55707497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55708529) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 671146 + ... + 671228.

It is an arithmetic number, because the mean of its divisors is an integer number (2349844).

Almost surely, 2^55708521 is an apocalyptic number.

It is an amenable number.

55708521 is a deficient number, since it is larger than the sum of its proper divisors (28885863).

55708521 is a wasteful number, since it uses less digits than its factorization.

55708521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 55708521 is about 7463.8141054021. The cubic root of 55708521 is about 381.9212967068.

The spelling of 55708521 in words is "fifty-five million, seven hundred eight thousand, five hundred twenty-one".