78168129 has 16 divisors (see below), whose sum is σ = 113404032. Its totient is φ = 47605248.

The previous prime is 78168127. The next prime is 78168149. The reversal of 78168129 is 92186187.

It is not a de Polignac number, because 78168129 - 2¹ = 78168127 is a prime.

It is a super-2 number, since 2×78168129² = 12220512782721282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78168121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6549 + ... + 14114.

It is an arithmetic number, because the mean of its divisors is an integer number (7087752).

Almost surely, 2^78168129 is an apocalyptic number.

It is an amenable number.

78168129 is a deficient number, since it is larger than the sum of its proper divisors (35235903).

78168129 is a wasteful number, since it uses less digits than its factorization.

78168129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20776.

The product of its digits is 48384, while the sum is 42.

The square root of 78168129 is about 8841.2741728780. The cubic root of 78168129 is about 427.5726383871.

The spelling of 78168129 in words is "seventy-eight million, one hundred sixty-eight thousand, one hundred twenty-nine".