72072440 has 48 divisors (see below), whose sum is σ = 178257240. Its totient is φ = 26206400.

The previous prime is 72072437. The next prime is 72072443. The reversal of 72072440 is 4427027.

It is an interprime number because it is at equal distance from previous prime (72072437) and next prime (72072443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72072443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2606 + ... + 12285.

Almost surely, 2^72072440 is an apocalyptic number.

It is an amenable number.

72072440 is an abundant number, since it is smaller than the sum of its proper divisors (106184800).

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

72072440 is a wasteful number, since it uses less digits than its factorization.

72072440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14924 (or 14909 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 72072440 is about 8489.5488690507. The cubic root of 72072440 is about 416.1562375422.

Adding to 72072440 its reverse (4427027), we get a palindrome (76499467).

The spelling of 72072440 in words is "seventy-two million, seventy-two thousand, four hundred forty".