78782739 has 12 divisors (see below), whose sum is σ = 122193864. Its totient is φ = 45018624.

The previous prime is 78782729. The next prime is 78782741. The reversal of 78782739 is 93728787.

It is not a de Polignac number, because 78782739 - 2⁴ = 78782723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78782691 and 78782700.

It is not an unprimeable number, because it can be changed into a prime (78782729) 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, 267822 + ... + 268115.

It is an arithmetic number, because the mean of its divisors is an integer number (10182822).

Almost surely, 2^78782739 is an apocalyptic number.

78782739 is a deficient number, since it is larger than the sum of its proper divisors (43411125).

78782739 is a wasteful number, since it uses less digits than its factorization.

78782739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535954 (or 535947 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 51.

The square root of 78782739 is about 8875.9641166467. The cubic root of 78782739 is about 428.6903346099.

The spelling of 78782739 in words is "seventy-eight million, seven hundred eighty-two thousand, seven hundred thirty-nine".