78427980 has 96 divisors (see below), whose sum is σ = 245306880. Its totient is φ = 20802240.

The previous prime is 78427931. The next prime is 78428017. The reversal of 78427980 is 8972487.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167707 + ... + 168173.

It is an arithmetic number, because the mean of its divisors is an integer number (2555280).

Almost surely, 2^78427980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78427980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122653440).

78427980 is an abundant number, since it is smaller than the sum of its proper divisors (166878900).

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

78427980 is a wasteful number, since it uses less digits than its factorization.

78427980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 78427980 is about 8855.9573169703. The cubic root of 78427980 is about 428.0459015609.

The spelling of 78427980 in words is "seventy-eight million, four hundred twenty-seven thousand, nine hundred eighty".