72540433 has 6 divisors (see below), whose sum is σ = 84383826. Its totient is φ = 62177472.

The previous prime is 72540421. The next prime is 72540443. The reversal of 72540433 is 33404527.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 6492304 = 8127^2 + 2548^2 .

It is not a de Polignac number, because 72540433 - 2²¹ = 70443281 is a prime.

It is a super-2 number, since 2×72540433² = 10524228839654978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72540443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 740160 + ... + 740257.

It is an arithmetic number, because the mean of its divisors is an integer number (14063971).

Almost surely, 2^72540433 is an apocalyptic number.

It is an amenable number.

72540433 is a deficient number, since it is larger than the sum of its proper divisors (11843393).

72540433 is a wasteful number, since it uses less digits than its factorization.

72540433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480431 (or 1480424 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 72540433 is about 8517.0671595333. The cubic root of 72540433 is about 417.0550470110.

The spelling of 72540433 in words is "seventy-two million, five hundred forty thousand, four hundred thirty-three".