72146431 has 4 divisors (see below), whose sum is σ = 82453072. Its totient is φ = 61839792.

The previous prime is 72146387. The next prime is 72146443. The reversal of 72146431 is 13464127.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72146431 - 2¹¹ = 72144383 is a prime.

It is a super-2 number, since 2×72146431² = 10410215012075522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 72146431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72146491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5153310 + ... + 5153323.

It is an arithmetic number, because the mean of its divisors is an integer number (20613268).

Almost surely, 2^72146431 is an apocalyptic number.

72146431 is a deficient number, since it is larger than the sum of its proper divisors (10306641).

72146431 is a wasteful number, since it uses less digits than its factorization.

72146431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306640.

The product of its digits is 4032, while the sum is 28.

The square root of 72146431 is about 8493.9055210192. The cubic root of 72146431 is about 416.2986002586.

The spelling of 72146431 in words is "seventy-two million, one hundred forty-six thousand, four hundred thirty-one".