72251240 has 16 divisors (see below), whose sum is σ = 162565380. Its totient is φ = 28900480.

The previous prime is 72251237. The next prime is 72251273. The reversal of 72251240 is 4215227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71944324 + 306916 = 8482^2 + 554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903101 + ... + 903180.

Almost surely, 2^72251240 is an apocalyptic number.

It is an amenable number.

72251240 is an abundant number, since it is smaller than the sum of its proper divisors (90314140).

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

72251240 is a wasteful number, since it uses less digits than its factorization.

72251240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806292 (or 1806288 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 72251240 is about 8500.0729408635. The cubic root of 72251240 is about 416.5000919936.

Adding to 72251240 its reverse (4215227), we get a palindrome (76466467).

The spelling of 72251240 in words is "seventy-two million, two hundred fifty-one thousand, two hundred forty".