78542587 has 2 divisors, whose sum is σ = 78542588. Its totient is φ = 78542586.

The previous prime is 78542579. The next prime is 78542609. The reversal of 78542587 is 78524587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78542587 - 2³ = 78542579 is a prime.

It is not a weakly prime, because it can be changed into another prime (78542507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39271293 + 39271294.

It is an arithmetic number, because the mean of its divisors is an integer number (39271294).

Almost surely, 2^78542587 is an apocalyptic number.

78542587 is a deficient number, since it is larger than the sum of its proper divisors (1).

78542587 is an equidigital number, since it uses as much as digits as its factorization.

78542587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 627200, while the sum is 46.

The square root of 78542587 is about 8862.4255709145. The cubic root of 78542587 is about 428.2543015914.

The spelling of 78542587 in words is "seventy-eight million, five hundred forty-two thousand, five hundred eighty-seven".