72480031 has 4 divisors (see below), whose sum is σ = 78055432. Its totient is φ = 66904632.

The previous prime is 72480029. The next prime is 72480047. The reversal of 72480031 is 13008427.

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 72480031 - 2¹ = 72480029 is a prime.

It is a super-2 number, since 2×72480031² = 10506709787521922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72479978 and 72480005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72480091) 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, 2787681 + ... + 2787706.

It is an arithmetic number, because the mean of its divisors is an integer number (19513858).

Almost surely, 2^72480031 is an apocalyptic number.

72480031 is a deficient number, since it is larger than the sum of its proper divisors (5575401).

72480031 is a wasteful number, since it uses less digits than its factorization.

72480031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575400.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 72480031 is about 8513.5204821507. The cubic root of 72480031 is about 416.9392589232.

Adding to 72480031 its reverse (13008427), we get a palindrome (85488458).

The spelling of 72480031 in words is "seventy-two million, four hundred eighty thousand, thirty-one".