77122984 has 8 divisors (see below), whose sum is σ = 144605610. Its totient is φ = 38561488.

The previous prime is 77122973. The next prime is 77122987. The reversal of 77122984 is 48922177.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 1258884 = 8710^2 + 1122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×77122984² = 11895909322128512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77122987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820179 + ... + 4820194.

Almost surely, 2^77122984 is an apocalyptic number.

It is an amenable number.

77122984 is a deficient number, since it is larger than the sum of its proper divisors (67482626).

77122984 is a wasteful number, since it uses less digits than its factorization.

77122984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9640379 (or 9640375 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 77122984 is about 8781.9692552411. The cubic root of 77122984 is about 425.6584653367.

The spelling of 77122984 in words is "seventy-seven million, one hundred twenty-two thousand, nine hundred eighty-four".