77974487 has 2 divisors, whose sum is σ = 77974488. Its totient is φ = 77974486.

The previous prime is 77974483. The next prime is 77974493. The reversal of 77974487 is 78447977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77974487 - 2² = 77974483 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77974483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38987243 + 38987244.

It is an arithmetic number, because the mean of its divisors is an integer number (38987244).

Almost surely, 2^77974487 is an apocalyptic number.

77974487 is a deficient number, since it is larger than the sum of its proper divisors (1).

77974487 is an equidigital number, since it uses as much as digits as its factorization.

77974487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 53.

The square root of 77974487 is about 8830.3163589987. The cubic root of 77974487 is about 427.2192783286.

The spelling of 77974487 in words is "seventy-seven million, nine hundred seventy-four thousand, four hundred eighty-seven".