78264713522 has 18 divisors (see below), whose sum is σ = 117947395197. Its totient is φ = 38949769824.

The previous prime is 78264713521. The next prime is 78264713533. The reversal of 78264713522 is 22531746287.

It can be written as a sum of positive squares in 2 ways, for example, as 73864911961 + 4399801561 = 271781^2 + 66331^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=197819.

It is a super-2 number, since 2×78264713522² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78264713521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 133329713 + ... + 133330299.

Almost surely, 2^78264713522 is an apocalyptic number.

78264713522 is a deficient number, since it is larger than the sum of its proper divisors (39682681675).

78264713522 is an frugal number, since it uses more digits than its factorization.

78264713522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 926 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The spelling of 78264713522 in words is "seventy-eight billion, two hundred sixty-four million, seven hundred thirteen thousand, five hundred twenty-two".