78424587 has 12 divisors (see below), whose sum is σ = 119943720. Its totient is φ = 49207488.

The previous prime is 78424583. The next prime is 78424601. The reversal of 78424587 is 78542487.

It is not a de Polignac number, because 78424587 - 2² = 78424583 is a prime.

It is a super-2 number, since 2×78424587² = 12300831692241138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78424583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256137 + ... + 256442.

It is an arithmetic number, because the mean of its divisors is an integer number (9995310).

Almost surely, 2^78424587 is an apocalyptic number.

78424587 is a deficient number, since it is larger than the sum of its proper divisors (41519133).

78424587 is a wasteful number, since it uses less digits than its factorization.

78424587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512602 (or 512599 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 78424587 is about 8855.7657489344. The cubic root of 78424587 is about 428.0397286759.

The spelling of 78424587 in words is "seventy-eight million, four hundred twenty-four thousand, five hundred eighty-seven".