78644365 has 8 divisors (see below), whose sum is σ = 97417728. Its totient is φ = 60885840.

The previous prime is 78644359. The next prime is 78644387. The reversal of 78644365 is 56344687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78644365 - 2⁵ = 78644333 is a prime.

It is a super-2 number, since 2×78644365² = 12369872292506450, which contains 22 as substring.

It is a Duffinian number.

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, 253537 + ... + 253846.

It is an arithmetic number, because the mean of its divisors is an integer number (12177216).

Almost surely, 2^78644365 is an apocalyptic number.

It is an amenable number.

78644365 is a deficient number, since it is larger than the sum of its proper divisors (18773363).

78644365 is a wasteful number, since it uses less digits than its factorization.

78644365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507419.

The product of its digits is 483840, while the sum is 43.

The square root of 78644365 is about 8868.1658193789. The cubic root of 78644365 is about 428.4392036275.

The spelling of 78644365 in words is "seventy-eight million, six hundred forty-four thousand, three hundred sixty-five".