72760561 has 4 divisors (see below), whose sum is σ = 77040612. Its totient is φ = 68480512.

The previous prime is 72760549. The next prime is 72760577. The reversal of 72760561 is 16506727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16506727 = 1433 ⋅11519.

It can be written as a sum of positive squares in 2 ways, for example, as 41679936 + 31080625 = 6456^2 + 5575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72760561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72760531) 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, 2140000 + ... + 2140033.

It is an arithmetic number, because the mean of its divisors is an integer number (19260153).

Almost surely, 2^72760561 is an apocalyptic number.

It is an amenable number.

72760561 is a deficient number, since it is larger than the sum of its proper divisors (4280051).

72760561 is a wasteful number, since it uses less digits than its factorization.

72760561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280050.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 72760561 is about 8529.9801289335. The cubic root of 72760561 is about 417.4764799639.

The spelling of 72760561 in words is "seventy-two million, seven hundred sixty thousand, five hundred sixty-one".