78989562 has 36 divisors (see below), whose sum is σ = 177501870. Its totient is φ = 25356576.

The previous prime is 78989539. The next prime is 78989587. The reversal of 78989562 is 26598987.

It is a happy number.

78989562 is a `hidden beast` number, since 78 + 9 + 8 + 9 + 562 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 49406841 + 29582721 = 7029^2 + 5439^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78989499 and 78989508.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 202864 + ... + 203252.

Almost surely, 2^78989562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78989562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88750935).

78989562 is an abundant number, since it is smaller than the sum of its proper divisors (98512308).

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

78989562 is a wasteful number, since it uses less digits than its factorization.

78989562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 423 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 78989562 is about 8887.6072145432. The cubic root of 78989562 is about 429.0651440676.

The spelling of 78989562 in words is "seventy-eight million, nine hundred eighty-nine thousand, five hundred sixty-two".