78524929729 has 3 divisors (see below), whose sum is σ = 78525209953. Its totient is φ = 78524649506.

The previous prime is 78524929727. The next prime is 78524929733. The reversal of 78524929729 is 92792942587.

The square root of 78524929729 is 280223.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 78524929729 - 2¹ = 78524929727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78524929723) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 140112 + ... + 420334.

Almost surely, 2^78524929729 is an apocalyptic number.

78524929729 is the 280223-rd square number.

78524929729 is the 140112-nd centered octagonal number.

It is an amenable number.

78524929729 is a deficient number, since it is larger than the sum of its proper divisors (280224).

78524929729 is an frugal number, since it uses more digits than its factorization.

78524929729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560446 (or 280223 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 64.

Multiplying 78524929729 by its sum of digits (64), we get a square (5025595502656 = 2241784²).

The spelling of 78524929729 in words is "seventy-eight billion, five hundred twenty-four million, nine hundred twenty-nine thousand, seven hundred twenty-nine".