78581970 has 24 divisors (see below), whose sum is σ = 204313356. Its totient is φ = 20955168.

The previous prime is 78581959. The next prime is 78581981. The reversal of 78581970 is 7918587.

It is an interprime number because it is at equal distance from previous prime (78581959) and next prime (78581981).

It can be written as a sum of positive squares in 2 ways, for example, as 64496961 + 14085009 = 8031^2 + 3753^2 .

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 11 ways as a sum of consecutive naturals, for example, 436477 + ... + 436656.

Almost surely, 2^78581970 is an apocalyptic number.

78581970 is an abundant number, since it is smaller than the sum of its proper divisors (125731386).

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

78581970 is a wasteful number, since it uses less digits than its factorization.

78581970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873146 (or 873143 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 78581970 is about 8864.6472011017. The cubic root of 78581970 is about 428.3258683749.

The spelling of 78581970 in words is "seventy-eight million, five hundred eighty-one thousand, nine hundred seventy".