78129200723 has 4 divisors (see below), whose sum is σ = 89290515120. Its totient is φ = 66967886328.

The previous prime is 78129200713. The next prime is 78129200753. The reversal of 78129200723 is 32700292187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32700292187 = 257 ⋅127238491.

It is a de Polignac number, because none of the positive numbers 2^k-78129200723 is a prime.

It is a super-2 number, since 2×78129200723² (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 (78129200713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5580657188 + ... + 5580657201.

It is an arithmetic number, because the mean of its divisors is an integer number (22322628780).

Almost surely, 2^78129200723 is an apocalyptic number.

78129200723 is a deficient number, since it is larger than the sum of its proper divisors (11161314397).

78129200723 is a wasteful number, since it uses less digits than its factorization.

78129200723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161314396.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 78129200723 in words is "seventy-eight billion, one hundred twenty-nine million, two hundred thousand, seven hundred twenty-three".