55747920 has 160 divisors (see below), whose sum is σ = 182845440. Its totient is φ = 14031360.

The previous prime is 55747907. The next prime is 55747933. The reversal of 55747920 is 2974755.

It is an interprime number because it is at equal distance from previous prime (55747907) and next prime (55747933).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 438897 + ... + 439023.

It is an arithmetic number, because the mean of its divisors is an integer number (1142784).

Almost surely, 2^55747920 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 55747920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91422720).

55747920 is an abundant number, since it is smaller than the sum of its proper divisors (127097520).

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

55747920 is a wasteful number, since it uses less digits than its factorization.

55747920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 55747920 is about 7466.4529731326. The cubic root of 55747920 is about 382.0113114895.

The spelling of 55747920 in words is "fifty-five million, seven hundred forty-seven thousand, nine hundred twenty".