78204644 has 12 divisors (see below), whose sum is σ = 156409344. Its totient is φ = 33516264.

The previous prime is 78204631. The next prime is 78204653. The reversal of 78204644 is 44640287.

78204644 is an admirable number.

It is a super-2 number, since 2×78204644² = 12231932686333472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396484 + ... + 1396539.

It is an arithmetic number, because the mean of its divisors is an integer number (13034112).

Almost surely, 2^78204644 is an apocalyptic number.

It is an amenable number.

78204644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78204644 is a wasteful number, since it uses less digits than its factorization.

78204644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793034 (or 2793032 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 78204644 is about 8843.3389621794. The cubic root of 78204644 is about 427.6392059453.

The spelling of 78204644 in words is "seventy-eight million, two hundred four thousand, six hundred forty-four".