72440356 has 6 divisors (see below), whose sum is σ = 126770630. Its totient is φ = 36220176.

The previous prime is 72440353. The next prime is 72440387. The reversal of 72440356 is 65304427.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 33177600 = 6266^2 + 5760^2 .

It is not an unprimeable number, because it can be changed into a prime (72440353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055041 + ... + 9055048.

Almost surely, 2^72440356 is an apocalyptic number.

It is an amenable number.

72440356 is a deficient number, since it is larger than the sum of its proper divisors (54330274).

72440356 is a wasteful number, since it uses less digits than its factorization.

72440356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18110093 (or 18110091 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 72440356 is about 8511.1900460511. The cubic root of 72440356 is about 416.8631686120.

The spelling of 72440356 in words is "seventy-two million, four hundred forty thousand, three hundred fifty-six".