78756746 has 4 divisors (see below), whose sum is σ = 118135122. Its totient is φ = 39378372.

The previous prime is 78756737. The next prime is 78756773. The reversal of 78756746 is 64765787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64765787 = 29 ⋅2233303.

It can be written as a sum of positive squares in only one way, i.e., 75498721 + 3258025 = 8689^2 + 1805^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78756694 and 78756703.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19689185 + ... + 19689188.

Almost surely, 2^78756746 is an apocalyptic number.

78756746 is a deficient number, since it is larger than the sum of its proper divisors (39378376).

78756746 is a wasteful number, since it uses less digits than its factorization.

78756746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39378375.

The product of its digits is 1975680, while the sum is 50.

The square root of 78756746 is about 8874.4997605499. The cubic root of 78756746 is about 428.6431831074.

The spelling of 78756746 in words is "seventy-eight million, seven hundred fifty-six thousand, seven hundred forty-six".