78311536 has 20 divisors (see below), whose sum is σ = 155830552. Its totient is φ = 38097216.

The previous prime is 78311531. The next prime is 78311551. The reversal of 78311536 is 63511387.

It is a super-2 number, since 2×78311536² = 12265393341358592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65550 + ... + 66733.

Almost surely, 2^78311536 is an apocalyptic number.

It is an amenable number.

78311536 is a deficient number, since it is larger than the sum of its proper divisors (77519016).

78311536 is a wasteful number, since it uses less digits than its factorization.

78311536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132328 (or 132322 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 78311536 is about 8849.3805432923. The cubic root of 78311536 is about 427.8339531158.

The spelling of 78311536 in words is "seventy-eight million, three hundred eleven thousand, five hundred thirty-six".