78677550 has 72 divisors (see below), whose sum is σ = 241587216. Its totient is φ = 17982720.

The previous prime is 78677539. The next prime is 78677563. The reversal of 78677550 is 5577687.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78677496 and 78677505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9339 + ... + 15638.

It is an arithmetic number, because the mean of its divisors is an integer number (3355378).

Almost surely, 2^78677550 is an apocalyptic number.

78677550 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78677550 is an abundant number, since it is smaller than the sum of its proper divisors (162909666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78677550 is a wasteful number, since it uses less digits than its factorization.

78677550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002 (or 24994 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 45.

The square root of 78677550 is about 8870.0366402851. The cubic root of 78677550 is about 428.4994569618.

The spelling of 78677550 in words is "seventy-eight million, six hundred seventy-seven thousand, five hundred fifty".