78623746 has 4 divisors (see below), whose sum is σ = 117935622. Its totient is φ = 39311872.

The previous prime is 78623687. The next prime is 78623747. The reversal of 78623746 is 64732687.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64732687 = 521 ⋅124247.

It can be written as a sum of positive squares in only one way, i.e., 77633721 + 990025 = 8811^2 + 995^2 .

It is not an unprimeable number, because it can be changed into a prime (78623747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19655935 + ... + 19655938.

Almost surely, 2^78623746 is an apocalyptic number.

78623746 is a deficient number, since it is larger than the sum of its proper divisors (39311876).

78623746 is a wasteful number, since it uses less digits than its factorization.

78623746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39311875.

The product of its digits is 338688, while the sum is 43.

The square root of 78623746 is about 8867.0032141643. The cubic root of 78623746 is about 428.4017575876.

The spelling of 78623746 in words is "seventy-eight million, six hundred twenty-three thousand, seven hundred forty-six".