72394691 has 4 divisors (see below), whose sum is σ = 72490584. Its totient is φ = 72298800.

The previous prime is 72394633. The next prime is 72394697. The reversal of 72394691 is 19649327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19649327 = 29 ⋅677563.

It is a cyclic number.

It is not a de Polignac number, because 72394691 - 2⁶ = 72394627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72394697) 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, 46805 + ... + 48326.

It is an arithmetic number, because the mean of its divisors is an integer number (18122646).

Almost surely, 2^72394691 is an apocalyptic number.

72394691 is a deficient number, since it is larger than the sum of its proper divisors (95893).

72394691 is an equidigital number, since it uses as much as digits as its factorization.

72394691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95892.

The product of its digits is 81648, while the sum is 41.

The square root of 72394691 is about 8508.5069783129. The cubic root of 72394691 is about 416.7755560388.

The spelling of 72394691 in words is "seventy-two million, three hundred ninety-four thousand, six hundred ninety-one".