72543400 has 24 divisors (see below), whose sum is σ = 168663870. Its totient is φ = 29017280.

The previous prime is 72543397. The next prime is 72543407. The reversal of 72543400 is 434527.

It can be written as a sum of positive squares in 3 ways, for example, as 62821476 + 9721924 = 7926^2 + 3118^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (72543407) 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, 181159 + ... + 181558.

Almost surely, 2^72543400 is an apocalyptic number.

It is an amenable number.

72543400 is an abundant number, since it is smaller than the sum of its proper divisors (96120470).

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

72543400 is a wasteful number, since it uses less digits than its factorization.

72543400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362733 (or 362724 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 72543400 is about 8517.2413374285. The cubic root of 72543400 is about 417.0607329685.

Adding to 72543400 its reverse (434527), we get a palindrome (72977927).

The spelling of 72543400 in words is "seventy-two million, five hundred forty-three thousand, four hundred".