72145648 has 20 divisors (see below), whose sum is σ = 139944168. Its totient is φ = 36031040.

The previous prime is 72145639. The next prime is 72145657. The reversal of 72145648 is 84654127.

It is an interprime number because it is at equal distance from previous prime (72145639) and next prime (72145657).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15390 + ... + 19522.

Almost surely, 2^72145648 is an apocalyptic number.

It is an amenable number.

72145648 is a deficient number, since it is larger than the sum of its proper divisors (67798520).

72145648 is a wasteful number, since it uses less digits than its factorization.

72145648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232 (or 5226 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 72145648 is about 8493.8594290228. The cubic root of 72145648 is about 416.2970942336.

The spelling of 72145648 in words is "seventy-two million, one hundred forty-five thousand, six hundred forty-eight".