76991634 has 24 divisors (see below), whose sum is σ = 172994640. Its totient is φ = 25663716.

The previous prime is 76991633. The next prime is 76991641. The reversal of 76991634 is 43619967.

76991634 is a `hidden beast` number, since 7 + 6 + 9 + 9 + 1 + 634 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 76991634.

It is not an unprimeable number, because it can be changed into a prime (76991633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78724 + ... + 79695.

It is an arithmetic number, because the mean of its divisors is an integer number (7208110).

Almost surely, 2^76991634 is an apocalyptic number.

76991634 is an abundant number, since it is smaller than the sum of its proper divisors (96003006).

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

76991634 is a wasteful number, since it uses less digits than its factorization.

76991634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158436 (or 158424 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 76991634 is about 8774.4876773519. The cubic root of 76991634 is about 425.4166783135.

The spelling of 76991634 in words is "seventy-six million, nine hundred ninety-one thousand, six hundred thirty-four".