78264457215 has 16 divisors (see below), whose sum is σ = 143112150528. Its totient is φ = 35778037536.

The previous prime is 78264457189. The next prime is 78264457253. The reversal of 78264457215 is 51275446287.

It is not a de Polignac number, because 78264457215 - 2⁶ = 78264457151 is a prime.

It is a super-2 number, since 2×78264457215² (a number of 23 digits) 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 15 ways as a sum of consecutive naturals, for example, 372687787 + ... + 372687996.

It is an arithmetic number, because the mean of its divisors is an integer number (8944509408).

Almost surely, 2^78264457215 is an apocalyptic number.

78264457215 is a deficient number, since it is larger than the sum of its proper divisors (64847693313).

78264457215 is a wasteful number, since it uses less digits than its factorization.

78264457215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745375798.

The product of its digits is 3763200, while the sum is 51.

The spelling of 78264457215 in words is "seventy-eight billion, two hundred sixty-four million, four hundred fifty-seven thousand, two hundred fifteen".