72665031 has 4 divisors (see below), whose sum is σ = 96886712. Its totient is φ = 48443352.

The previous prime is 72665009. The next prime is 72665057. The reversal of 72665031 is 13056627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13056627 = 3 ⋅4352209.

It is not a de Polignac number, because 72665031 - 2⁶ = 72664967 is a prime.

It is a super-2 number, since 2×72665031² = 10560413460461922, 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 72665031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72665071) 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, 12110836 + ... + 12110841.

It is an arithmetic number, because the mean of its divisors is an integer number (24221678).

Almost surely, 2^72665031 is an apocalyptic number.

72665031 is a deficient number, since it is larger than the sum of its proper divisors (24221681).

72665031 is a wasteful number, since it uses less digits than its factorization.

72665031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24221680.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 72665031 is about 8524.3786283811. The cubic root of 72665031 is about 417.2936932349.

The spelling of 72665031 in words is "seventy-two million, six hundred sixty-five thousand, thirty-one".