72645448 has 32 divisors (see below), whose sum is σ = 138441600. Its totient is φ = 35733312.

The previous prime is 72645427. The next prime is 72645451. The reversal of 72645448 is 84454627.

It is a happy number.

It is a super-2 number, since 2×72645448² = 10554722230241408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72645448.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197761 + ... + 198127.

It is an arithmetic number, because the mean of its divisors is an integer number (4326300).

Almost surely, 2^72645448 is an apocalyptic number.

It is an amenable number.

72645448 is a deficient number, since it is larger than the sum of its proper divisors (65796152).

72645448 is a wasteful number, since it uses less digits than its factorization.

72645448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 705 counting only the distinct ones).

The product of its digits is 215040, while the sum is 40.

The square root of 72645448 is about 8523.2299042088. The cubic root of 72645448 is about 417.2562034158.

The spelling of 72645448 in words is "seventy-two million, six hundred forty-five thousand, four hundred forty-eight".