72686031 has 12 divisors (see below), whose sum is σ = 106526616. Its totient is φ = 44051920.

The previous prime is 72686023. The next prime is 72686051. The reversal of 72686031 is 13068627.

It is not a de Polignac number, because 72686031 - 2³ = 72686023 is a prime.

It is a super-2 number, since 2×72686031² = 10566518205065922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 72685983 and 72686001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72686021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99756 + ... + 100481.

It is an arithmetic number, because the mean of its divisors is an integer number (8877218).

Almost surely, 2^72686031 is an apocalyptic number.

72686031 is a deficient number, since it is larger than the sum of its proper divisors (33840585).

72686031 is a wasteful number, since it uses less digits than its factorization.

72686031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200262 (or 200251 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 72686031 is about 8525.6103007351. The cubic root of 72686031 is about 417.3338882842. Note that the first 3 decimals are identical.

The spelling of 72686031 in words is "seventy-two million, six hundred eighty-six thousand, thirty-one".