72440784 has 80 divisors (see below), whose sum is σ = 223944000. Its totient is φ = 22287744.

The previous prime is 72440743. The next prime is 72440789. The reversal of 72440784 is 48704427.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72440789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (2799300).

Almost surely, 2^72440784 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 72440784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111972000).

72440784 is an abundant number, since it is smaller than the sum of its proper divisors (151503216).

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

72440784 is a wasteful number, since it uses less digits than its factorization.

72440784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12929 (or 12917 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 72440784 is about 8511.2151893839. The cubic root of 72440784 is about 416.8639895958.

The spelling of 72440784 in words is "seventy-two million, four hundred forty thousand, seven hundred eighty-four".