72139880 has 16 divisors (see below), whose sum is σ = 162314820. Its totient is φ = 28855936.

The previous prime is 72139867. The next prime is 72139889. The reversal of 72139880 is 8893127.

It can be written as a sum of positive squares in 2 ways, for example, as 63648484 + 8491396 = 7978^2 + 2914^2 .

It is not an unprimeable number, because it can be changed into a prime (72139889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901709 + ... + 901788.

Almost surely, 2^72139880 is an apocalyptic number.

It is an amenable number.

72139880 is an abundant number, since it is smaller than the sum of its proper divisors (90174940).

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

72139880 is a wasteful number, since it uses less digits than its factorization.

72139880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803508 (or 1803504 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 72139880 is about 8493.5198828283. The cubic root of 72139880 is about 416.2859997061.

The spelling of 72139880 in words is "seventy-two million, one hundred thirty-nine thousand, eight hundred eighty".