78641424 has 45 divisors (see below), whose sum is σ = 220384983. Its totient is φ = 26178336.

The previous prime is 78641411. The next prime is 78641449. The reversal of 78641424 is 42414687.

The square root of 78641424 is 8868.

It is a perfect power (a square), and thus also a powerful number.

78641424 is a `hidden beast` number, since 7 + 8 + 641 + 4 + 2 + 4 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 106047 + ... + 106785.

Almost surely, 2^78641424 is an apocalyptic number.

78641424 is the 8868-th square number.

It is an amenable number.

78641424 is an abundant number, since it is smaller than the sum of its proper divisors (141743559).

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

78641424 is an equidigital number, since it uses as much as digits as its factorization.

78641424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492 (or 744 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The cubic root of 78641424 is about 428.4338628956.

Multiplying 78641424 by its sum of digits (36), we get a square (2831091264 = 53208²).

78641424 divided by its sum of digits (36) gives a square (2184484 = 1478²).

The spelling of 78641424 in words is "seventy-eight million, six hundred forty-one thousand, four hundred twenty-four".