72947240 has 16 divisors (see below), whose sum is σ = 164131380. Its totient is φ = 29178880.

The previous prime is 72947207. The next prime is 72947291. The reversal of 72947240 is 4274927.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68923204 + 4024036 = 8302^2 + 2006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72947240.

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, 911801 + ... + 911880.

Almost surely, 2^72947240 is an apocalyptic number.

It is an amenable number.

72947240 is an abundant number, since it is smaller than the sum of its proper divisors (91184140).

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

72947240 is a wasteful number, since it uses less digits than its factorization.

72947240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823692 (or 1823688 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 72947240 is about 8540.9156417799. The cubic root of 72947240 is about 417.8332095563.

The spelling of 72947240 in words is "seventy-two million, nine hundred forty-seven thousand, two hundred forty".