77995794240 has 1120 divisors, whose sum is σ = 349866021120. Its totient is φ = 16052649984.

The previous prime is 77995794161. The next prime is 77995794251. The reversal of 77995794240 is 4249759977.

77995794240 is a `hidden beast` number, since 77 + 99 + 57 + 9 + 424 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 101424576 + ... + 101425344.

It is an arithmetic number, because the mean of its divisors is an integer number (312380376).

Almost surely, 2^77995794240 is an apocalyptic number.

77995794240 is a gapful number since it is divisible by the number (70) 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 77995794240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174933010560).

77995794240 is an abundant number, since it is smaller than the sum of its proper divisors (271870226880).

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

77995794240 is a wasteful number, since it uses less digits than its factorization.

77995794240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 40007520, while the sum is 63.

The spelling of 77995794240 in words is "seventy-seven billion, nine hundred ninety-five million, seven hundred ninety-four thousand, two hundred forty".