78804621840 has 80 divisors (see below), whose sum is σ = 279193523328. Its totient is φ = 18012484608.

The previous prime is 78804621839. The next prime is 78804621853. The reversal of 78804621840 is 4812640887.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×78804621840³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 78804621840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23452077 + ... + 23455436.

Almost surely, 2^78804621840 is an apocalyptic number.

78804621840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78804621840 is an abundant number, since it is smaller than the sum of its proper divisors (200388901488).

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

78804621840 is a wasteful number, since it uses less digits than its factorization.

78804621840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46907536 (or 46907530 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The spelling of 78804621840 in words is "seventy-eight billion, eight hundred four million, six hundred twenty-one thousand, eight hundred forty".