78421377020 has 24 divisors (see below), whose sum is σ = 188211305184. Its totient is φ = 26887329216.

The previous prime is 78421377011. The next prime is 78421377037. The reversal of 78421377020 is 2077312487.

It is a super-2 number, since 2×78421377020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280076207 + ... + 280076486.

It is an arithmetic number, because the mean of its divisors is an integer number (7842137716).

Almost surely, 2^78421377020 is an apocalyptic number.

78421377020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78421377020 is an abundant number, since it is smaller than the sum of its proper divisors (109789928164).

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

78421377020 is a wasteful number, since it uses less digits than its factorization.

78421377020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560152709 (or 560152707 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The spelling of 78421377020 in words is "seventy-eight billion, four hundred twenty-one million, three hundred seventy-seven thousand, twenty".