72215632 has 10 divisors (see below), whose sum is σ = 139917818. Its totient is φ = 36107808.

The previous prime is 72215617. The next prime is 72215659. The reversal of 72215632 is 23651227.

It can be written as a sum of positive squares in only one way, i.e., 52359696 + 19855936 = 7236^2 + 4456^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72215632.

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, 2256723 + ... + 2256754.

Almost surely, 2^72215632 is an apocalyptic number.

It is an amenable number.

72215632 is a deficient number, since it is larger than the sum of its proper divisors (67702186).

72215632 is a wasteful number, since it uses less digits than its factorization.

72215632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513485 (or 4513479 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 72215632 is about 8497.9781124689. The cubic root of 72215632 is about 416.4316586937.

Adding to 72215632 its reverse (23651227), we get a palindrome (95866859).

The spelling of 72215632 in words is "seventy-two million, two hundred fifteen thousand, six hundred thirty-two".