55779872620 has 24 divisors (see below), whose sum is σ = 119861867664. Its totient is φ = 21793066176.

The previous prime is 55779872591. The next prime is 55779872627. The reversal of 55779872620 is 2627897755.

It is a happy number.

It is a super-2 number, since 2×55779872620² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55779872627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32429299 + ... + 32431018.

It is an arithmetic number, because the mean of its divisors is an integer number (4994244486).

Almost surely, 2^55779872620 is an apocalyptic number.

It is an amenable number.

55779872620 is an abundant number, since it is smaller than the sum of its proper divisors (64081995044).

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

55779872620 is a wasteful number, since it uses less digits than its factorization.

55779872620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64860369 (or 64860367 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 58.

The spelling of 55779872620 in words is "fifty-five billion, seven hundred seventy-nine million, eight hundred seventy-two thousand, six hundred twenty".