76999980 has 24 divisors (see below), whose sum is σ = 215600112. Its totient is φ = 20533312.

The previous prime is 76999963. The next prime is 76999981. The reversal of 76999980 is 8999967.

It is a self number, because there is not a number n which added to its sum of digits gives 76999980.

It is not an unprimeable number, because it can be changed into a prime (76999981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641607 + ... + 641726.

It is an arithmetic number, because the mean of its divisors is an integer number (8983338).

Almost surely, 2^76999980 is an apocalyptic number.

It is an amenable number.

76999980 is an abundant number, since it is smaller than the sum of its proper divisors (138600132).

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

76999980 is a wasteful number, since it uses less digits than its factorization.

76999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283345 (or 1283343 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 57.

The square root of 76999980 is about 8774.9632477863. The cubic root of 76999980 is about 425.4320496776.

The spelling of 76999980 in words is "seventy-six million, nine hundred ninety-nine thousand, nine hundred eighty".