78947739 has 12 divisors (see below), whose sum is σ = 122807776. Its totient is φ = 48583152.

The previous prime is 78947689. The next prime is 78947741. The reversal of 78947739 is 93774987.

It is not a de Polignac number, because 78947739 - 2¹² = 78943643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78947839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337267 + ... + 337500.

Almost surely, 2^78947739 is an apocalyptic number.

78947739 is a deficient number, since it is larger than the sum of its proper divisors (43860037).

78947739 is a wasteful number, since it uses less digits than its factorization.

78947739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674786 (or 674783 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 78947739 is about 8885.2540200042. The cubic root of 78947739 is about 428.9894042732.

The spelling of 78947739 in words is "seventy-eight million, nine hundred forty-seven thousand, seven hundred thirty-nine".