72569661 has 8 divisors (see below), whose sum is σ = 96905184. Its totient is φ = 48306960.

The previous prime is 72569659. The next prime is 72569701. The reversal of 72569661 is 16696527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72569661 - 2¹ = 72569659 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72569641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15835 + ... + 19896.

It is an arithmetic number, because the mean of its divisors is an integer number (12113148).

Almost surely, 2^72569661 is an apocalyptic number.

It is an amenable number.

72569661 is a deficient number, since it is larger than the sum of its proper divisors (24335523).

72569661 is a wasteful number, since it uses less digits than its factorization.

72569661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36411.

The product of its digits is 136080, while the sum is 42.

The square root of 72569661 is about 8518.7828355934. The cubic root of 72569661 is about 417.1110527796. Note that the first 3 decimals are identical.

The spelling of 72569661 in words is "seventy-two million, five hundred sixty-nine thousand, six hundred sixty-one".