78255129 has 32 divisors (see below), whose sum is σ = 115240960. Its totient is φ = 47044800.

The previous prime is 78255071. The next prime is 78255161. The reversal of 78255129 is 92155287.

It is not a de Polignac number, because 78255129 - 2¹⁶ = 78189593 is a prime.

It is a super-2 number, since 2×78255129² = 12247730429613282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78255929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118059 + ... + 118719.

It is an arithmetic number, because the mean of its divisors is an integer number (3601280).

Almost surely, 2^78255129 is an apocalyptic number.

It is an amenable number.

78255129 is a deficient number, since it is larger than the sum of its proper divisors (36985831).

78255129 is a wasteful number, since it uses less digits than its factorization.

78255129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781.

The product of its digits is 50400, while the sum is 39.

The square root of 78255129 is about 8846.1929099472. The cubic root of 78255129 is about 427.7312069664.

The spelling of 78255129 in words is "seventy-eight million, two hundred fifty-five thousand, one hundred twenty-nine".