55699728 has 80 divisors (see below), whose sum is σ = 166239360. Its totient is φ = 15740928.

The previous prime is 55699727. The next prime is 55699733. The reversal of 55699728 is 82799655.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55699727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31738 + ... + 33446.

It is an arithmetic number, because the mean of its divisors is an integer number (2077992).

Almost surely, 2^55699728 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 55699728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83119680).

55699728 is an abundant number, since it is smaller than the sum of its proper divisors (110539632).

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

55699728 is a wasteful number, since it uses less digits than its factorization.

55699728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1818 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 51.

The square root of 55699728 is about 7463.2250401552. The cubic root of 55699728 is about 381.9012015723.

The spelling of 55699728 in words is "fifty-five million, six hundred ninety-nine thousand, seven hundred twenty-eight".