78634140508 has 48 divisors (see below), whose sum is σ = 171773409024. Its totient is φ = 30599533440.

The previous prime is 78634140503. The next prime is 78634140589. The reversal of 78634140508 is 80504143687.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78634140503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100360 + ... + 409072.

It is an arithmetic number, because the mean of its divisors is an integer number (3578612688).

Almost surely, 2^78634140508 is an apocalyptic number.

It is an amenable number.

78634140508 is an abundant number, since it is smaller than the sum of its proper divisors (93139268516).

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

78634140508 is a wasteful number, since it uses less digits than its factorization.

78634140508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309562 (or 309560 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 78634140508 in words is "seventy-eight billion, six hundred thirty-four million, one hundred forty thousand, five hundred eight".