72340661 has 16 divisors (see below), whose sum is σ = 80372736. Its totient is φ = 64809216.

The previous prime is 72340651. The next prime is 72340669. The reversal of 72340661 is 16604327.

It is a cyclic number.

It is not a de Polignac number, because 72340661 - 2¹⁰ = 72339637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72340669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28340 + ... + 30786.

It is an arithmetic number, because the mean of its divisors is an integer number (5023296).

Almost surely, 2^72340661 is an apocalyptic number.

It is an amenable number.

72340661 is a deficient number, since it is larger than the sum of its proper divisors (8032075).

72340661 is a wasteful number, since it uses less digits than its factorization.

72340661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 72340661 is about 8505.3313280554. The cubic root of 72340661 is about 416.6718468334.

Adding to 72340661 its reverse (16604327), we get a palindrome (88944988).

The spelling of 72340661 in words is "seventy-two million, three hundred forty thousand, six hundred sixty-one".