72440304 has 80 divisors (see below), whose sum is σ = 195701760. Its totient is φ = 23063040.

The previous prime is 72440299. The next prime is 72440311. The reversal of 72440304 is 40304427.

It is a super-2 number, since 2×72440304² = 10495195287224832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 132159 + ... + 132705.

It is an arithmetic number, because the mean of its divisors is an integer number (2446272).

Almost surely, 2^72440304 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 72440304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97850880).

72440304 is an abundant number, since it is smaller than the sum of its proper divisors (123261456).

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

72440304 is a wasteful number, since it uses less digits than its factorization.

72440304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 72440304 is about 8511.1869912486. The cubic root of 72440304 is about 416.8630688661.

The spelling of 72440304 in words is "seventy-two million, four hundred forty thousand, three hundred four".