72447812 has 12 divisors (see below), whose sum is σ = 134241660. Its totient is φ = 34093056.

The previous prime is 72447799. The next prime is 72447827. The reversal of 72447812 is 21874427.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38738176 + 33709636 = 6224^2 + 5806^2 .

It is a super-3 number, since 3×72447812³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 532637 + ... + 532772.

It is an arithmetic number, because the mean of its divisors is an integer number (11186805).

Almost surely, 2^72447812 is an apocalyptic number.

It is an amenable number.

72447812 is a deficient number, since it is larger than the sum of its proper divisors (61793848).

72447812 is a wasteful number, since it uses less digits than its factorization.

72447812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065430 (or 1065428 counting only the distinct ones).

The product of its digits is 25088, while the sum is 35.

The square root of 72447812 is about 8511.6280463845. The cubic root of 72447812 is about 416.8774701483.

The spelling of 72447812 in words is "seventy-two million, four hundred forty-seven thousand, eight hundred twelve".