72154889 has 8 divisors (see below), whose sum is σ = 74017800. Its totient is φ = 70310656.

The previous prime is 72154883. The next prime is 72154891. The reversal of 72154889 is 98845127.

It can be written as a sum of positive squares in 4 ways, for example, as 193600 + 71961289 = 440^2 + 8483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72154889 - 2⁸ = 72154633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72154883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3329 + ... + 12465.

It is an arithmetic number, because the mean of its divisors is an integer number (9252225).

Almost surely, 2^72154889 is an apocalyptic number.

It is an amenable number.

72154889 is a deficient number, since it is larger than the sum of its proper divisors (1862911).

72154889 is a wasteful number, since it uses less digits than its factorization.

72154889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339.

The product of its digits is 161280, while the sum is 44.

The square root of 72154889 is about 8494.4033928228. The cubic root of 72154889 is about 416.3148677114.

The spelling of 72154889 in words is "seventy-two million, one hundred fifty-four thousand, eight hundred eighty-nine".