72017744 has 10 divisors (see below), whose sum is σ = 139534410. Its totient is φ = 36008864.

The previous prime is 72017711. The next prime is 72017773. The reversal of 72017744 is 44771027.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 14440000 = 7588^2 + 3800^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72017744.

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, 2250539 + ... + 2250570.

It is an arithmetic number, because the mean of its divisors is an integer number (13953441).

Almost surely, 2^72017744 is an apocalyptic number.

It is an amenable number.

72017744 is a deficient number, since it is larger than the sum of its proper divisors (67516666).

72017744 is a wasteful number, since it uses less digits than its factorization.

72017744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501117 (or 4501111 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 72017744 is about 8486.3268850546. The cubic root of 72017744 is about 416.0509368102.

The spelling of 72017744 in words is "seventy-two million, seventeen thousand, seven hundred forty-four".