21977580744 has 384 divisors, whose sum is σ = 75209904000. Its totient is φ = 5912621568.

The previous prime is 21977580643. The next prime is 21977580791. The reversal of 21977580744 is 44708577912.

21977580744 is a `hidden beast` number, since 2 + 19 + 7 + 7 + 580 + 7 + 44 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 58920942 + ... + 58921314.

It is an arithmetic number, because the mean of its divisors is an integer number (195859125).

Almost surely, 2^21977580744 is an apocalyptic number.

21977580744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21977580744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37604952000).

21977580744 is an abundant number, since it is smaller than the sum of its proper divisors (53232323256).

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

21977580744 is a wasteful number, since it uses less digits than its factorization.

21977580744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The spelling of 21977580744 in words is "twenty-one billion, nine hundred seventy-seven million, five hundred eighty thousand, seven hundred forty-four".