7881066 has 12 divisors (see below), whose sum is σ = 17075682. Its totient is φ = 2627016.

The previous prime is 7881059. The next prime is 7881073. The reversal of 7881066 is 6601887.

It is an interprime number because it is at equal distance from previous prime (7881059) and next prime (7881073).

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 1147041 = 2595^2 + 1071^2 .

It is a super-2 number, since 2×7881066² = 124222402592712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7881066.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218901 + ... + 218936.

Almost surely, 2^7881066 is an apocalyptic number.

7881066 is an abundant number, since it is smaller than the sum of its proper divisors (9194616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7881066 is a wasteful number, since it uses less digits than its factorization.

7881066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437845 (or 437842 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 7881066 is about 2807.3236364908. The cubic root of 7881066 is about 199.0039307995.

The spelling of 7881066 in words is "seven million, eight hundred eighty-one thousand, sixty-six".