78129275 has 72 divisors (see below), whose sum is σ = 122135040. Its totient is φ = 49304640.

The previous prime is 78129251. The next prime is 78129281. The reversal of 78129275 is 57292187.

It is not a de Polignac number, because 78129275 - 2⁸ = 78129019 is a prime.

It is a super-3 number, since 3×78129275³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1324196 + ... + 1324254.

It is an arithmetic number, because the mean of its divisors is an integer number (1696320).

Almost surely, 2^78129275 is an apocalyptic number.

78129275 is a deficient number, since it is larger than the sum of its proper divisors (44005765).

78129275 is a wasteful number, since it uses less digits than its factorization.

78129275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 141 counting only the distinct ones).

The product of its digits is 70560, while the sum is 41.

The square root of 78129275 is about 8839.0765920429. The cubic root of 78129275 is about 427.5017840173.

The spelling of 78129275 in words is "seventy-eight million, one hundred twenty-nine thousand, two hundred seventy-five".