78749436 has 24 divisors (see below), whose sum is σ = 184557520. Its totient is φ = 26134272.

The previous prime is 78749417. The next prime is 78749441. The reversal of 78749436 is 63494787.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11581 + ... + 17076.

Almost surely, 2^78749436 is an apocalyptic number.

It is an amenable number.

78749436 is an abundant number, since it is smaller than the sum of its proper divisors (105808084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78749436 is a wasteful number, since it uses less digits than its factorization.

78749436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28893 (or 28891 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The square root of 78749436 is about 8874.0878967925. The cubic root of 78749436 is about 428.6299208419.

The spelling of 78749436 in words is "seventy-eight million, seven hundred forty-nine thousand, four hundred thirty-six".