78839767440 has 120 divisors (see below), whose sum is σ = 302594555328. Its totient is φ = 18020517120.

The previous prime is 78839767429. The next prime is 78839767451. The reversal of 78839767440 is 4476793887.

It is an interprime number because it is at equal distance from previous prime (78839767429) and next prime (78839767451).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7816366 + ... + 7826445.

Almost surely, 2^78839767440 is an apocalyptic number.

78839767440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78839767440 is an abundant number, since it is smaller than the sum of its proper divisors (223754787888).

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

78839767440 is a wasteful number, since it uses less digits than its factorization.

78839767440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15642837 (or 15642828 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 63.

The spelling of 78839767440 in words is "seventy-eight billion, eight hundred thirty-nine million, seven hundred sixty-seven thousand, four hundred forty".