55697328 has 80 divisors (see below), whose sum is σ = 165068800. Its totient is φ = 17962560.

The previous prime is 55697309. The next prime is 55697333. The reversal of 55697328 is 82379655.

It is a happy number.

55697328 is a `hidden beast` number, since 556 + 9 + 73 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11313 + ... + 15471.

It is an arithmetic number, because the mean of its divisors is an integer number (2063360).

Almost surely, 2^55697328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55697328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82534400).

55697328 is an abundant number, since it is smaller than the sum of its proper divisors (109371472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55697328 is a wasteful number, since it uses less digits than its factorization.

55697328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4207 (or 4195 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 55697328 is about 7463.0642500249. The cubic root of 55697328 is about 381.8957163507.

The spelling of 55697328 in words is "fifty-five million, six hundred ninety-seven thousand, three hundred twenty-eight".