78787489 has 16 divisors (see below), whose sum is σ = 90541440. Its totient is φ = 67858560.

The previous prime is 78787477. The next prime is 78787529. The reversal of 78787489 is 98478787.

It is not a de Polignac number, because 78787489 - 2¹³ = 78779297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78787409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26149 + ... + 29005.

It is an arithmetic number, because the mean of its divisors is an integer number (5658840).

Almost surely, 2^78787489 is an apocalyptic number.

It is an amenable number.

78787489 is a deficient number, since it is larger than the sum of its proper divisors (11753951).

78787489 is a wasteful number, since it uses less digits than its factorization.

78787489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000.

The product of its digits is 6322176, while the sum is 58.

The square root of 78787489 is about 8876.2316891798. The cubic root of 78787489 is about 428.6989500258.

The spelling of 78787489 in words is "seventy-eight million, seven hundred eighty-seven thousand, four hundred eighty-nine".