129522978 has 24 divisors (see below), whose sum is σ = 302220828. Its totient is φ = 39853152.

The previous prime is 129522971. The next prime is 129522979. The reversal of 129522978 is 879225921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 128663649 + 859329 = 11343^2 + 927^2 .

It is not an unprimeable number, because it can be changed into a prime (129522971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276525 + ... + 276992.

Almost surely, 2^129522978 is an apocalyptic number.

129522978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129522978 is an abundant number, since it is smaller than the sum of its proper divisors (172697850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129522978 is a wasteful number, since it uses less digits than its factorization.

129522978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553538 (or 553535 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 129522978 is about 11380.8162273187. The cubic root of 129522978 is about 505.9593279708.

The spelling of 129522978 in words is "one hundred twenty-nine million, five hundred twenty-two thousand, nine hundred seventy-eight".