78315472 has 20 divisors (see below), whose sum is σ = 153303556. Its totient is φ = 38753280.

The previous prime is 78315463. The next prime is 78315487. The reversal of 78315472 is 27451387.

It can be written as a sum of positive squares in 2 ways, for example, as 50183056 + 28132416 = 7084^2 + 5304^2 .

It is a super-2 number, since 2×78315472² = 12266626309165568, which contains 22 as substring.

It is a congruent number.

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, 23679 + ... + 26782.

Almost surely, 2^78315472 is an apocalyptic number.

It is an amenable number.

78315472 is a deficient number, since it is larger than the sum of its proper divisors (74988084).

78315472 is a wasteful number, since it uses less digits than its factorization.

78315472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50566 (or 50560 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 78315472 is about 8849.6029289455. The cubic root of 78315472 is about 427.8411207538.

It can be divided in two parts, 78315 and 472, that added together give a palindrome (78787).

The spelling of 78315472 in words is "seventy-eight million, three hundred fifteen thousand, four hundred seventy-two".