72129250 has 64 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 27120000.

The previous prime is 72129247. The next prime is 72129259. The reversal of 72129250 is 5292127.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72129259) 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, 317637 + ... + 317863.

It is an arithmetic number, because the mean of its divisors is an integer number (2240784).

Almost surely, 2^72129250 is an apocalyptic number.

72129250 is the 4540-th nonagonal number.

72129250 is a deficient number, since it is larger than the sum of its proper divisors (71280926).

72129250 is a wasteful number, since it uses less digits than its factorization.

72129250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 72129250 is about 8492.8940885896. The cubic root of 72129250 is about 416.2655517581.

The spelling of 72129250 in words is "seventy-two million, one hundred twenty-nine thousand, two hundred fifty".