77983880 has 32 divisors (see below), whose sum is σ = 188962200. Its totient is φ = 28793856.

The previous prime is 77983877. The next prime is 77983883. The reversal of 77983880 is 8838977.

It is an interprime number because it is at equal distance from previous prime (77983877) and next prime (77983883).

It can be written as a sum of positive squares in 4 ways, for example, as 22600516 + 55383364 = 4754^2 + 7442^2 .

It is not an unprimeable number, because it can be changed into a prime (77983883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74465 + ... + 75504.

Almost surely, 2^77983880 is an apocalyptic number.

It is an amenable number.

77983880 is an abundant number, since it is smaller than the sum of its proper divisors (110978320).

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

77983880 is a wasteful number, since it uses less digits than its factorization.

77983880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149993 (or 149989 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 77983880 is about 8830.8482038817. The cubic root of 77983880 is about 427.2364322710.

The spelling of 77983880 in words is "seventy-seven million, nine hundred eighty-three thousand, eight hundred eighty".