78472564 has 6 divisors (see below), whose sum is σ = 137326994. Its totient is φ = 39236280.

The previous prime is 78472529. The next prime is 78472571. The reversal of 78472564 is 46527487.

It can be written as a sum of positive squares in only one way, i.e., 78180964 + 291600 = 8842^2 + 540^2 .

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 78472564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9809067 + ... + 9809074.

Almost surely, 2^78472564 is an apocalyptic number.

It is an amenable number.

78472564 is a deficient number, since it is larger than the sum of its proper divisors (58854430).

78472564 is a wasteful number, since it uses less digits than its factorization.

78472564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19618145 (or 19618143 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 78472564 is about 8858.4741349738. The cubic root of 78472564 is about 428.1269966980.

The spelling of 78472564 in words is "seventy-eight million, four hundred seventy-two thousand, five hundred sixty-four".