77972634894 has 128 divisors (see below), whose sum is σ = 206842097664. Its totient is φ = 18970560000.

The previous prime is 77972634841. The next prime is 77972634931. The reversal of 77972634894 is 49843627977.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 1633669 + ... + 1680719.

It is an arithmetic number, because the mean of its divisors is an integer number (1615953888).

Almost surely, 2^77972634894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77972634894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103421048832).

77972634894 is an abundant number, since it is smaller than the sum of its proper divisors (128869462770).

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

77972634894 is a wasteful number, since it uses less digits than its factorization.

77972634894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47302.

The product of its digits is 128024064, while the sum is 66.

The spelling of 77972634894 in words is "seventy-seven billion, nine hundred seventy-two million, six hundred thirty-four thousand, eight hundred ninety-four".