72136631 has 4 divisors (see below), whose sum is σ = 82441872. Its totient is φ = 61831392.

The previous prime is 72136621. The next prime is 72136663. The reversal of 72136631 is 13663127.

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

It is a de Polignac number, because none of the positive numbers 2^k-72136631 is a prime.

It is a super-2 number, since 2×72136631² = 10407387064060322, 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 = 72136594 and 72136603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72136621) 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, 5152610 + ... + 5152623.

It is an arithmetic number, because the mean of its divisors is an integer number (20610468).

Almost surely, 2^72136631 is an apocalyptic number.

72136631 is a deficient number, since it is larger than the sum of its proper divisors (10305241).

72136631 is a wasteful number, since it uses less digits than its factorization.

72136631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10305240.

The product of its digits is 4536, while the sum is 29.

The square root of 72136631 is about 8493.3286172148. The cubic root of 72136631 is about 416.2797501184.

Adding to 72136631 its reverse (13663127), we get a palindrome (85799758).

The spelling of 72136631 in words is "seventy-two million, one hundred thirty-six thousand, six hundred thirty-one".