78491616 has 48 divisors (see below), whose sum is σ = 235476864. Its totient is φ = 22425984.

The previous prime is 78491593. The next prime is 78491701. The reversal of 78491616 is 61619487.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57730 + ... + 59073.

It is an arithmetic number, because the mean of its divisors is an integer number (4905768).

Almost surely, 2^78491616 is an apocalyptic number.

It is an amenable number.

78491616 is an abundant number, since it is smaller than the sum of its proper divisors (156985248).

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

78491616 is a wasteful number, since it uses less digits than its factorization.

78491616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116823 (or 116815 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 78491616 is about 8859.5494242089. The cubic root of 78491616 is about 428.1616415688.

The spelling of 78491616 in words is "seventy-eight million, four hundred ninety-one thousand, six hundred sixteen".