78940647 has 36 divisors (see below), whose sum is σ = 120720600. Its totient is φ = 49678272.

The previous prime is 78940627. The next prime is 78940679. The reversal of 78940647 is 74604987.

It is not a de Polignac number, because 78940647 - 2⁸ = 78940391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78940627) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 529729 + ... + 529877.

It is an arithmetic number, because the mean of its divisors is an integer number (3353350).

Almost surely, 2^78940647 is an apocalyptic number.

78940647 is a deficient number, since it is larger than the sum of its proper divisors (41779953).

78940647 is a wasteful number, since it uses less digits than its factorization.

78940647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 78940647 is about 8884.8549228448. The cubic root of 78940647 is about 428.9765582901.

The spelling of 78940647 in words is "seventy-eight million, nine hundred forty thousand, six hundred forty-seven".