72304631 has 4 divisors (see below), whose sum is σ = 82633872. Its totient is φ = 61975392.

The previous prime is 72304577. The next prime is 72304643. The reversal of 72304631 is 13640327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13640327 = 631 ⋅21617.

It is a cyclic number.

It is not a de Polignac number, because 72304631 - 2⁶ = 72304567 is a prime.

It is a super-2 number, since 2×72304631² = 10455919328092322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72304631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72304651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5164610 + ... + 5164623.

It is an arithmetic number, because the mean of its divisors is an integer number (20658468).

Almost surely, 2^72304631 is an apocalyptic number.

72304631 is a deficient number, since it is larger than the sum of its proper divisors (10329241).

72304631 is a wasteful number, since it uses less digits than its factorization.

72304631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329240.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 72304631 is about 8503.2129809855. The cubic root of 72304631 is about 416.6026594657.

Adding to 72304631 its reverse (13640327), we get a palindrome (85944958).

The spelling of 72304631 in words is "seventy-two million, three hundred four thousand, six hundred thirty-one".