72143432 has 32 divisors (see below), whose sum is σ = 137884800. Its totient is φ = 35380800.

The previous prime is 72143431. The next prime is 72143447. The reversal of 72143432 is 23434127.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72143431) 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, 133082 + ... + 133622.

It is an arithmetic number, because the mean of its divisors is an integer number (4308900).

Almost surely, 2^72143432 is an apocalyptic number.

It is an amenable number.

72143432 is a deficient number, since it is larger than the sum of its proper divisors (65741368).

72143432 is a wasteful number, since it uses less digits than its factorization.

72143432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 833 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 72143432 is about 8493.7289808423. The cubic root of 72143432 is about 416.2928319123.

Adding to 72143432 its reverse (23434127), we get a palindrome (95577559).

The spelling of 72143432 in words is "seventy-two million, one hundred forty-three thousand, four hundred thirty-two".