76218881 has 2 divisors, whose sum is σ = 76218882. Its totient is φ = 76218880.

The previous prime is 76218869. The next prime is 76218887. The reversal of 76218881 is 18881267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 14753281 = 7840^2 + 3841^2 .

It is an emirp because it is prime and its reverse (18881267) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76218881 is a prime.

It is a super-2 number, since 2×76218881² = 11618635641784322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (76218887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38109440 + 38109441.

It is an arithmetic number, because the mean of its divisors is an integer number (38109441).

Almost surely, 2^76218881 is an apocalyptic number.

It is an amenable number.

76218881 is a deficient number, since it is larger than the sum of its proper divisors (1).

76218881 is an equidigital number, since it uses as much as digits as its factorization.

76218881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 41.

The square root of 76218881 is about 8730.3425476896. The cubic root of 76218881 is about 423.9886095937.

The spelling of 76218881 in words is "seventy-six million, two hundred eighteen thousand, eight hundred eighty-one".