72294661 has 4 divisors (see below), whose sum is σ = 72316300. Its totient is φ = 72273024.

The previous prime is 72294631. The next prime is 72294671. The reversal of 72294661 is 16649227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16649227 = 7 ⋅2378461.

It can be written as a sum of positive squares in 2 ways, for example, as 14062500 + 58232161 = 3750^2 + 7631^2 .

It is a cyclic number.

It is not a de Polignac number, because 72294661 - 2¹¹ = 72292613 is a prime.

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 72294661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72294631) 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, 4626 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (18079075).

Almost surely, 2^72294661 is an apocalyptic number.

It is an amenable number.

72294661 is a deficient number, since it is larger than the sum of its proper divisors (21639).

72294661 is a wasteful number, since it uses less digits than its factorization.

72294661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21638.

The product of its digits is 36288, while the sum is 37.

The square root of 72294661 is about 8502.6267117874. The cubic root of 72294661 is about 416.5835103029.

The spelling of 72294661 in words is "seventy-two million, two hundred ninety-four thousand, six hundred sixty-one".