72886661 has 2 divisors, whose sum is σ = 72886662. Its totient is φ = 72886660.

The previous prime is 72886601. The next prime is 72886703. The reversal of 72886661 is 16668827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62710561 + 10176100 = 7919^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 72886661 - 2¹⁴ = 72870277 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72886601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36443330 + 36443331.

It is an arithmetic number, because the mean of its divisors is an integer number (36443331).

Almost surely, 2^72886661 is an apocalyptic number.

It is an amenable number.

72886661 is a deficient number, since it is larger than the sum of its proper divisors (1).

72886661 is an equidigital number, since it uses as much as digits as its factorization.

72886661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 72886661 is about 8537.3685055759. The cubic root of 72886661 is about 417.7175143955.

The spelling of 72886661 in words is "seventy-two million, eight hundred eighty-six thousand, six hundred sixty-one".