78490687 has 16 divisors (see below), whose sum is σ = 88865280. Its totient is φ = 68702400.

The previous prime is 78490679. The next prime is 78490747. The reversal of 78490687 is 78609487.

It is a cyclic number.

It is not a de Polignac number, because 78490687 - 2³ = 78490679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78490687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78490637) 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, 34528 + ... + 36730.

It is an arithmetic number, because the mean of its divisors is an integer number (5554080).

Almost surely, 2^78490687 is an apocalyptic number.

78490687 is a deficient number, since it is larger than the sum of its proper divisors (10374593).

78490687 is a wasteful number, since it uses less digits than its factorization.

78490687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 78490687 is about 8859.4969947509. The cubic root of 78490687 is about 428.1599523704.

The spelling of 78490687 in words is "seventy-eight million, four hundred ninety thousand, six hundred eighty-seven".