78631056840 has 128 divisors (see below), whose sum is σ = 271560418560. Its totient is φ = 17841598464.

The previous prime is 78631056839. The next prime is 78631056841. The reversal of 78631056840 is 4865013687.

It is an interprime number because it is at equal distance from previous prime (78631056839) and next prime (78631056841).

It is a self number, because there is not a number n which added to its sum of digits gives 78631056840.

It is not an unprimeable number, because it can be changed into a prime (78631056841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226557 + ... + 456716.

It is an arithmetic number, because the mean of its divisors is an integer number (2121565770).

Almost surely, 2^78631056840 is an apocalyptic number.

78631056840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78631056840 is an abundant number, since it is smaller than the sum of its proper divisors (192929361720).

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

78631056840 is a wasteful number, since it uses less digits than its factorization.

78631056840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683431 (or 683427 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 78631056840 in words is "seventy-eight billion, six hundred thirty-one million, fifty-six thousand, eight hundred forty".