78994378280 has 32 divisors (see below), whose sum is σ = 178024543200. Its totient is φ = 31546694976.

The previous prime is 78994378277. The next prime is 78994378313. The reversal of 78994378280 is 8287349987.

It is a super-2 number, since 2×78994378280² (a number of 23 digits) contains 22 as substring.

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, 1570442 + ... + 1619961.

It is an arithmetic number, because the mean of its divisors is an integer number (5563266975).

Almost surely, 2^78994378280 is an apocalyptic number.

It is an amenable number.

78994378280 is an abundant number, since it is smaller than the sum of its proper divisors (99030164920).

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

78994378280 is a wasteful number, since it uses less digits than its factorization.

78994378280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191033 (or 3191029 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 65.

The spelling of 78994378280 in words is "seventy-eight billion, nine hundred ninety-four million, three hundred seventy-eight thousand, two hundred eighty".