55785530790 has 128 divisors (see below), whose sum is σ = 163193356800. Its totient is φ = 13448085120.

The previous prime is 55785530783. The next prime is 55785530819. The reversal of 55785530790 is 9703558755.

55785530790 is a `hidden beast` number, since 557 + 8 + 55 + 30 + 7 + 9 + 0 = 666.

It is a super-2 number, since 2×55785530790² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 479164 + ... + 584096.

It is an arithmetic number, because the mean of its divisors is an integer number (1274948100).

Almost surely, 2^55785530790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55785530790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81596678400).

55785530790 is an abundant number, since it is smaller than the sum of its proper divisors (107407826010).

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

55785530790 is a wasteful number, since it uses less digits than its factorization.

55785530790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105139 (or 105133 counting only the distinct ones).

The product of its (nonzero) digits is 6615000, while the sum is 54.

The spelling of 55785530790 in words is "fifty-five billion, seven hundred eighty-five million, five hundred thirty thousand, seven hundred ninety".