78243980 has 12 divisors (see below), whose sum is σ = 164312400. Its totient is φ = 31297584.

The previous prime is 78243967. The next prime is 78244021. The reversal of 78243980 is 8934287.

It is a super-2 number, since 2×78243980² = 12244240812480800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956080 + ... + 1956119.

It is an arithmetic number, because the mean of its divisors is an integer number (13692700).

Almost surely, 2^78243980 is an apocalyptic number.

It is an amenable number.

78243980 is an abundant number, since it is smaller than the sum of its proper divisors (86068420).

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

78243980 is a wasteful number, since it uses less digits than its factorization.

78243980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912208 (or 3912206 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 78243980 is about 8845.5627294141. The cubic root of 78243980 is about 427.7108930617.

The spelling of 78243980 in words is "seventy-eight million, two hundred forty-three thousand, nine hundred eighty".