77240987 has 2 divisors, whose sum is σ = 77240988. Its totient is φ = 77240986.

The previous prime is 77240963. The next prime is 77240993. The reversal of 77240987 is 78904277.

It is a strong prime.

It is an emirp because it is prime and its reverse (78904277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77240987 - 2²⁴ = 60463771 is a prime.

It is not a weakly prime, because it can be changed into another prime (77240927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38620493 + 38620494.

It is an arithmetic number, because the mean of its divisors is an integer number (38620494).

Almost surely, 2^77240987 is an apocalyptic number.

77240987 is a deficient number, since it is larger than the sum of its proper divisors (1).

77240987 is an equidigital number, since it uses as much as digits as its factorization.

77240987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 77240987 is about 8788.6851690113. The cubic root of 77240987 is about 425.8754494194.

The spelling of 77240987 in words is "seventy-seven million, two hundred forty thousand, nine hundred eighty-seven".