78493508 has 6 divisors (see below), whose sum is σ = 137363646. Its totient is φ = 39246752.

The previous prime is 78493489. The next prime is 78493511. The reversal of 78493508 is 80539487.

It can be written as a sum of positive squares in only one way, i.e., 55472704 + 23020804 = 7448^2 + 4798^2 .

It is a super-2 number, since 2×78493508² = 12322461596292128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9811685 + ... + 9811692.

It is an arithmetic number, because the mean of its divisors is an integer number (22893941).

Almost surely, 2^78493508 is an apocalyptic number.

It is an amenable number.

78493508 is a deficient number, since it is larger than the sum of its proper divisors (58870138).

78493508 is a wasteful number, since it uses less digits than its factorization.

78493508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19623381 (or 19623379 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 78493508 is about 8859.6562010046. The cubic root of 78493508 is about 428.1650817465.

The spelling of 78493508 in words is "seventy-eight million, four hundred ninety-three thousand, five hundred eight".