55396720 has 20 divisors (see below), whose sum is σ = 128797560. Its totient is φ = 22158656.

The previous prime is 55396711. The next prime is 55396729. The reversal of 55396720 is 2769355.

It is an interprime number because it is at equal distance from previous prime (55396711) and next prime (55396729).

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 55396720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55396729) 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, 346150 + ... + 346309.

It is an arithmetic number, because the mean of its divisors is an integer number (6439878).

Almost surely, 2^55396720 is an apocalyptic number.

It is an amenable number.

55396720 is an abundant number, since it is smaller than the sum of its proper divisors (73400840).

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

55396720 is a wasteful number, since it uses less digits than its factorization.

55396720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692472 (or 692466 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 55396720 is about 7442.8972853318. The cubic root of 55396720 is about 381.2074244313.

The spelling of 55396720 in words is "fifty-five million, three hundred ninety-six thousand, seven hundred twenty".