55747440 has 200 divisors, whose sum is σ = 221459040. Its totient is φ = 12731904.

The previous prime is 55747429. The next prime is 55747477. The reversal of 55747440 is 4474755.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55747395 and 55747404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44746 + ... + 45974.

Almost surely, 2^55747440 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 55747440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110729520).

55747440 is an abundant number, since it is smaller than the sum of its proper divisors (165711600).

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

55747440 is a wasteful number, since it uses less digits than its factorization.

55747440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The square root of 55747440 is about 7466.4208292863. The cubic root of 55747440 is about 382.0102150901.

The spelling of 55747440 in words is "fifty-five million, seven hundred forty-seven thousand, four hundred forty".