78424900 has 18 divisors (see below), whose sum is σ = 170182250. Its totient is φ = 31369920.

The previous prime is 78424891. The next prime is 78424909. The reversal of 78424900 is 942487.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78424891) and next prime (78424909).

It can be written as a sum of positive squares in 3 ways, for example, as 25542916 + 52881984 = 5054^2 + 7272^2 .

It is not an unprimeable number, because it can be changed into a prime (78424909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392025 + ... + 392224.

Almost surely, 2^78424900 is an apocalyptic number.

It is an amenable number.

78424900 is an abundant number, since it is smaller than the sum of its proper divisors (91757350).

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

78424900 is a wasteful number, since it uses less digits than its factorization.

78424900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784263 (or 784256 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78424900 is about 8855.7834210193. The cubic root of 78424900 is about 428.0402981243.

The spelling of 78424900 in words is "seventy-eight million, four hundred twenty-four thousand, nine hundred".