72797761 has 2 divisors, whose sum is σ = 72797762. Its totient is φ = 72797760.

The previous prime is 72797749. The next prime is 72797807. The reversal of 72797761 is 16779727.

It is an a-pointer prime, because the next prime (72797807) can be obtained adding 72797761 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 7187761 = 8100^2 + 2681^2 .

It is an emirp because it is prime and its reverse (16779727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72797761 - 2⁷ = 72797633 is a prime.

It is a super-2 number, since 2×72797761² = 10599028013226242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72797731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36398880 + 36398881.

It is an arithmetic number, because the mean of its divisors is an integer number (36398881).

Almost surely, 2^72797761 is an apocalyptic number.

It is an amenable number.

72797761 is a deficient number, since it is larger than the sum of its proper divisors (1).

72797761 is an equidigital number, since it uses as much as digits as its factorization.

72797761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259308, while the sum is 46.

The square root of 72797761 is about 8532.1603946480. The cubic root of 72797761 is about 417.5476150171.

The spelling of 72797761 in words is "seventy-two million, seven hundred ninety-seven thousand, seven hundred sixty-one".