72481784 has 8 divisors (see below), whose sum is σ = 135903360. Its totient is φ = 36240888.

The previous prime is 72481777. The next prime is 72481807. The reversal of 72481784 is 48718427.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4530104 + ... + 4530119.

It is an arithmetic number, because the mean of its divisors is an integer number (16987920).

Almost surely, 2^72481784 is an apocalyptic number.

It is an amenable number.

72481784 is a deficient number, since it is larger than the sum of its proper divisors (63421576).

72481784 is a wasteful number, since it uses less digits than its factorization.

72481784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060229 (or 9060225 counting only the distinct ones).

The product of its digits is 100352, while the sum is 41.

The square root of 72481784 is about 8513.6234354122. The cubic root of 72481784 is about 416.9426202565.

The spelling of 72481784 in words is "seventy-two million, four hundred eighty-one thousand, seven hundred eighty-four".