78540636 has 12 divisors (see below), whose sum is σ = 183261512. Its totient is φ = 26180208.

The previous prime is 78540599. The next prime is 78540641. The reversal of 78540636 is 63604587.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 78540594 and 78540603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3272515 + ... + 3272538.

Almost surely, 2^78540636 is an apocalyptic number.

It is an amenable number.

78540636 is an abundant number, since it is smaller than the sum of its proper divisors (104720876).

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

78540636 is a wasteful number, since it uses less digits than its factorization.

78540636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545060 (or 6545058 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 78540636 is about 8862.3154987847. The cubic root of 78540636 is about 428.2507556126.

The spelling of 78540636 in words is "seventy-eight million, five hundred forty thousand, six hundred thirty-six".