78509364 has 24 divisors (see below), whose sum is σ = 187087488. Its totient is φ = 25612800.

The previous prime is 78509363. The next prime is 78509369. The reversal of 78509364 is 46390587.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78509363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69037 + ... + 70164.

It is an arithmetic number, because the mean of its divisors is an integer number (7795312).

Almost surely, 2^78509364 is an apocalyptic number.

It is an amenable number.

78509364 is an abundant number, since it is smaller than the sum of its proper divisors (108578124).

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

78509364 is a wasteful number, since it uses less digits than its factorization.

78509364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139255 (or 139253 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 78509364 is about 8860.5509986682. The cubic root of 78509364 is about 428.1939101538.

The spelling of 78509364 in words is "seventy-eight million, five hundred nine thousand, three hundred sixty-four".