5621187780 has 336 divisors, whose sum is σ = 19496461824. Its totient is φ = 1352090880.

The previous prime is 5621187763. The next prime is 5621187799. The reversal of 5621187780 is 877811265.

It is a happy number.

5621187780 is a `hidden beast` number, since 5 + 621 + 18 + 7 + 7 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 8908065 + ... + 8908695.

It is an arithmetic number, because the mean of its divisors is an integer number (58025184).

Almost surely, 2^5621187780 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 5621187780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9748230912).

5621187780 is an abundant number, since it is smaller than the sum of its proper divisors (13875274044).

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

5621187780 is a wasteful number, since it uses less digits than its factorization.

5621187780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 5621187780 is about 74974.5808924598. The cubic root of 5621187780 is about 1778.0447937502.

The spelling of 5621187780 in words is "five billion, six hundred twenty-one million, one hundred eighty-seven thousand, seven hundred eighty".