72451808 has 96 divisors (see below), whose sum is σ = 170698752. Its totient is φ = 29836800.

The previous prime is 72451793. The next prime is 72451829. The reversal of 72451808 is 80815427.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324785 + ... + 325007.

It is an arithmetic number, because the mean of its divisors is an integer number (1778112).

Almost surely, 2^72451808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72451808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85349376).

72451808 is an abundant number, since it is smaller than the sum of its proper divisors (98246944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72451808 is a wasteful number, since it uses less digits than its factorization.

72451808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 72451808 is about 8511.8627808489. The cubic root of 72451808 is about 416.8851345700.

The spelling of 72451808 in words is "seventy-two million, four hundred fifty-one thousand, eight hundred eight".