78471774 has 16 divisors (see below), whose sum is σ = 174381840. Its totient is φ = 26157240.

The previous prime is 78471763. The next prime is 78471781. The reversal of 78471774 is 47717487.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726537 + ... + 726644.

It is an arithmetic number, because the mean of its divisors is an integer number (10898865).

Almost surely, 2^78471774 is an apocalyptic number.

78471774 is an abundant number, since it is smaller than the sum of its proper divisors (95910066).

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

78471774 is a wasteful number, since it uses less digits than its factorization.

78471774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453192 (or 1453186 counting only the distinct ones).

The product of its digits is 307328, while the sum is 45.

The square root of 78471774 is about 8858.4295447895. The cubic root of 78471774 is about 428.1255600113.

The spelling of 78471774 in words is "seventy-eight million, four hundred seventy-one thousand, seven hundred seventy-four".