66892889 has 8 divisors (see below), whose sum is σ = 78009600. Its totient is φ = 57336468.

The previous prime is 66892883. The next prime is 66892897. The reversal of 66892889 is 98829866.

It is a de Polignac number, because none of the positive numbers 2^k-66892889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66892883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97169 + ... + 97854.

It is an arithmetic number, because the mean of its divisors is an integer number (9751200).

Almost surely, 2^66892889 is an apocalyptic number.

It is an amenable number.

66892889 is a deficient number, since it is larger than the sum of its proper divisors (11116711).

66892889 is an equidigital number, since it uses as much as digits as its factorization.

66892889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195044 (or 195030 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 56.

The square root of 66892889 is about 8178.8073091374. The cubic root of 66892889 is about 405.9382585463.

The spelling of 66892889 in words is "sixty-six million, eight hundred ninety-two thousand, eight hundred eighty-nine".