55978740 has 72 divisors (see below), whose sum is σ = 170476488. Its totient is φ = 14868480.

The previous prime is 55978723. The next prime is 55978751. The reversal of 55978740 is 4787955.

It can be written as a sum of positive squares in 4 ways, for example, as 535824 + 55442916 = 732^2 + 7446^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63100 + ... + 63980.

It is an arithmetic number, because the mean of its divisors is an integer number (2367729).

Almost surely, 2^55978740 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 55978740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85238244).

55978740 is an abundant number, since it is smaller than the sum of its proper divisors (114497748).

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

55978740 is a wasteful number, since it uses less digits than its factorization.

55978740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 55978740 is about 7481.8941452015. The cubic root of 55978740 is about 382.5378150490.

The spelling of 55978740 in words is "fifty-five million, nine hundred seventy-eight thousand, seven hundred forty".