72440040 has 32 divisors (see below), whose sum is σ = 217320480. Its totient is φ = 19317312.

The previous prime is 72440033. The next prime is 72440063. The reversal of 72440040 is 4004427.

It is a junction number, because it is equal to n+sod(n) for n = 72439989 and 72440016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301714 + ... + 301953.

It is an arithmetic number, because the mean of its divisors is an integer number (6791265).

Almost surely, 2^72440040 is an apocalyptic number.

It is an amenable number.

72440040 is an abundant number, since it is smaller than the sum of its proper divisors (144880440).

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

72440040 is a wasteful number, since it uses less digits than its factorization.

72440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603681 (or 603677 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 72440040 is about 8511.1714822344. The cubic root of 72440040 is about 416.8625624630.

Adding to 72440040 its reverse (4004427), we get a palindrome (76444467).

The spelling of 72440040 in words is "seventy-two million, four hundred forty thousand, forty".