72497540 has 24 divisors (see below), whose sum is σ = 160258560. Its totient is φ = 27472608.

The previous prime is 72497533. The next prime is 72497549. The reversal of 72497540 is 4579427.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 72497494 and 72497503.

It is not an unprimeable number, because it can be changed into a prime (72497549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95012 + ... + 95771.

It is an arithmetic number, because the mean of its divisors is an integer number (6677440).

Almost surely, 2^72497540 is an apocalyptic number.

It is an amenable number.

72497540 is an abundant number, since it is smaller than the sum of its proper divisors (87761020).

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

72497540 is a wasteful number, since it uses less digits than its factorization.

72497540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190811 (or 190809 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 72497540 is about 8514.5487255638. The cubic root of 72497540 is about 416.9728295570.

It can be divided in two parts, 72497 and 540, that added together give a palindrome (73037).

The spelling of 72497540 in words is "seventy-two million, four hundred ninety-seven thousand, five hundred forty".