78421296 has 20 divisors (see below), whose sum is σ = 202588472. Its totient is φ = 26140416.

The previous prime is 78421271. The next prime is 78421309. The reversal of 78421296 is 69212487.

It is a super-2 number, since 2×78421296² = 12299799332639232, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816841 + ... + 816936.

Almost surely, 2^78421296 is an apocalyptic number.

It is an amenable number.

78421296 is an abundant number, since it is smaller than the sum of its proper divisors (124167176).

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

78421296 is a wasteful number, since it uses less digits than its factorization.

78421296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633788 (or 1633782 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 78421296 is about 8855.5799358371. The cubic root of 78421296 is about 428.0337411895.

The spelling of 78421296 in words is "seventy-eight million, four hundred twenty-one thousand, two hundred ninety-six".