72814661 has 4 divisors (see below), whose sum is σ = 73303500. Its totient is φ = 72325824.

The previous prime is 72814649. The next prime is 72814667. The reversal of 72814661 is 16641827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16641827 = 17 ⋅978931.

It can be written as a sum of positive squares in 2 ways, for example, as 13432225 + 59382436 = 3665^2 + 7706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72814661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72814667) 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, 244196 + ... + 244493.

It is an arithmetic number, because the mean of its divisors is an integer number (18325875).

Almost surely, 2^72814661 is an apocalyptic number.

It is an amenable number.

72814661 is a deficient number, since it is larger than the sum of its proper divisors (488839).

72814661 is a wasteful number, since it uses less digits than its factorization.

72814661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488838.

The product of its digits is 16128, while the sum is 35.

The square root of 72814661 is about 8533.1507076812. The cubic root of 72814661 is about 417.5799237430.

The spelling of 72814661 in words is "seventy-two million, eight hundred fourteen thousand, six hundred sixty-one".