72551240 has 32 divisors (see below), whose sum is σ = 172844280. Its totient is φ = 27313152.

The previous prime is 72551233. The next prime is 72551251. The reversal of 72551240 is 4215527.

It can be written as a sum of positive squares in 4 ways, for example, as 65966884 + 6584356 = 8122^2 + 2566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52667 + ... + 54026.

Almost surely, 2^72551240 is an apocalyptic number.

It is an amenable number.

72551240 is an abundant number, since it is smaller than the sum of its proper divisors (100293040).

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

72551240 is a wasteful number, since it uses less digits than its factorization.

72551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106721 (or 106717 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 72551240 is about 8517.7015679114. The cubic root of 72551240 is about 417.0757567950.

Adding to 72551240 its reverse (4215527), we get a palindrome (76766767).

The spelling of 72551240 in words is "seventy-two million, five hundred fifty-one thousand, two hundred forty".