78422580 has 60 divisors (see below), whose sum is σ = 246019620. Its totient is φ = 20912256.

The previous prime is 78422569. The next prime is 78422587. The reversal of 78422580 is 8522487.

It is a happy number.

78422580 is a `hidden beast` number, since 78 + 4 + 2 + 2 + 580 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61873956 + 16548624 = 7866^2 + 4068^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78422587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22585 + ... + 25824.

It is an arithmetic number, because the mean of its divisors is an integer number (4100327).

Almost surely, 2^78422580 is an apocalyptic number.

It is an amenable number.

78422580 is an abundant number, since it is smaller than the sum of its proper divisors (167597040).

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

78422580 is a wasteful number, since it uses less digits than its factorization.

78422580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48430 (or 48419 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 78422580 is about 8855.6524322040. The cubic root of 78422580 is about 428.0360772570.

The spelling of 78422580 in words is "seventy-eight million, four hundred twenty-two thousand, five hundred eighty".