78431746 has 8 divisors (see below), whose sum is σ = 118031760. Its totient is φ = 39087828.

The previous prime is 78431687. The next prime is 78431777. The reversal of 78431746 is 64713487.

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

It is a junction number, because it is equal to n+sod(n) for n = 78431699 and 78431708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63256 + ... + 64483.

It is an arithmetic number, because the mean of its divisors is an integer number (14753970).

Almost surely, 2^78431746 is an apocalyptic number.

78431746 is a deficient number, since it is larger than the sum of its proper divisors (39600014).

78431746 is a wasteful number, since it uses less digits than its factorization.

78431746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128048.

The product of its digits is 112896, while the sum is 40.

The square root of 78431746 is about 8856.1699396522. The cubic root of 78431746 is about 428.0527528362.

The spelling of 78431746 in words is "seventy-eight million, four hundred thirty-one thousand, seven hundred forty-six".