72635131 has 4 divisors (see below), whose sum is σ = 73314072. Its totient is φ = 71956192.

The previous prime is 72635117. The next prime is 72635141. The reversal of 72635131 is 13153627.

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 72635131 - 2⁵ = 72635099 is a prime.

It is a super-2 number, since 2×72635131² = 10551724510774322, 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 72635131.

It is not an unprimeable number, because it can be changed into a prime (72635141) 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, 339310 + ... + 339523.

It is an arithmetic number, because the mean of its divisors is an integer number (18328518).

Almost surely, 2^72635131 is an apocalyptic number.

72635131 is a deficient number, since it is larger than the sum of its proper divisors (678941).

72635131 is a wasteful number, since it uses less digits than its factorization.

72635131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678940.

The product of its digits is 3780, while the sum is 28.

The square root of 72635131 is about 8522.6246544125. The cubic root of 72635131 is about 417.2364497759.

Adding to 72635131 its reverse (13153627), we get a palindrome (85788758).

The spelling of 72635131 in words is "seventy-two million, six hundred thirty-five thousand, one hundred thirty-one".