72821677 has 2 divisors, whose sum is σ = 72821678. Its totient is φ = 72821676.

The previous prime is 72821663. The next prime is 72821681. The reversal of 72821677 is 77612827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66814276 + 6007401 = 8174^2 + 2451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72821677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72821687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36410838 + 36410839.

It is an arithmetic number, because the mean of its divisors is an integer number (36410839).

Almost surely, 2^72821677 is an apocalyptic number.

It is an amenable number.

72821677 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821677 is an equidigital number, since it uses as much as digits as its factorization.

72821677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65856, while the sum is 40.

The square root of 72821677 is about 8533.5618003270. The cubic root of 72821677 is about 417.5933351751.

The spelling of 72821677 in words is "seventy-two million, eight hundred twenty-one thousand, six hundred seventy-seven".