78047420 has 36 divisors (see below), whose sum is σ = 180159672. Its totient is φ = 28380000.

The previous prime is 78047419. The next prime is 78047443. The reversal of 78047420 is 2474087.

It is a congruent number.

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, 13706 + ... + 18545.

Almost surely, 2^78047420 is an apocalyptic number.

It is an amenable number.

78047420 is an abundant number, since it is smaller than the sum of its proper divisors (102112252).

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

78047420 is a wasteful number, since it uses less digits than its factorization.

78047420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32282 (or 32269 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 78047420 is about 8834.4450872706. The cubic root of 78047420 is about 427.3524358748.

The spelling of 78047420 in words is "seventy-eight million, forty-seven thousand, four hundred twenty".