77572987 has 2 divisors, whose sum is σ = 77572988. Its totient is φ = 77572986.

The previous prime is 77572933. The next prime is 77572993. The reversal of 77572987 is 78927577.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77572987 is a prime.

It is not a weakly prime, because it can be changed into another prime (77572927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38786493 + 38786494.

It is an arithmetic number, because the mean of its divisors is an integer number (38786494).

Almost surely, 2^77572987 is an apocalyptic number.

77572987 is a deficient number, since it is larger than the sum of its proper divisors (1).

77572987 is an equidigital number, since it uses as much as digits as its factorization.

77572987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728720, while the sum is 52.

The square root of 77572987 is about 8807.5528383314. The cubic root of 77572987 is about 426.4847483605.

The spelling of 77572987 in words is "seventy-seven million, five hundred seventy-two thousand, nine hundred eighty-seven".