72877817 has 2 divisors, whose sum is σ = 72877818. Its totient is φ = 72877816.

The previous prime is 72877813. The next prime is 72877829. The reversal of 72877817 is 71877827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72777961 + 99856 = 8531^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 72877817 - 2² = 72877813 is a prime.

It is a super-2 number, since 2×72877817² = 10622352421370978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72877813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36438908 + 36438909.

It is an arithmetic number, because the mean of its divisors is an integer number (36438909).

Almost surely, 2^72877817 is an apocalyptic number.

It is an amenable number.

72877817 is a deficient number, since it is larger than the sum of its proper divisors (1).

72877817 is an equidigital number, since it uses as much as digits as its factorization.

72877817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 307328, while the sum is 47.

The square root of 72877817 is about 8536.8505316656. The cubic root of 72877817 is about 417.7006185599.

The spelling of 72877817 in words is "seventy-two million, eight hundred seventy-seven thousand, eight hundred seventeen".