72304331 has 4 divisors (see below), whose sum is σ = 78877464. Its totient is φ = 65731200.

The previous prime is 72304303. The next prime is 72304339. The reversal of 72304331 is 13340327.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72304331 - 2¹⁰ = 72303307 is a prime.

It is a super-2 number, since 2×72304331² = 10455832562715122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72304297 and 72304306.

It is not an unprimeable number, because it can be changed into a prime (72304339) 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, 3286550 + ... + 3286571.

It is an arithmetic number, because the mean of its divisors is an integer number (19719366).

Almost surely, 2^72304331 is an apocalyptic number.

72304331 is a deficient number, since it is larger than the sum of its proper divisors (6573133).

72304331 is a wasteful number, since it uses less digits than its factorization.

72304331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6573132.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 72304331 is about 8503.1953405764. The cubic root of 72304331 is about 416.6020832879.

Adding to 72304331 its reverse (13340327), we get a palindrome (85644658).

It can be divided in two parts, 72 and 304331, that added together give a palindrome (304403).

The spelling of 72304331 in words is "seventy-two million, three hundred four thousand, three hundred thirty-one".