66891948 has 24 divisors (see below), whose sum is σ = 156408000. Its totient is φ = 22250640.

The previous prime is 66891947. The next prime is 66891953. The reversal of 66891948 is 84919866.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66891948.

It is not an unprimeable number, because it can be changed into a prime (66891947) 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, 403 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (6517000).

Almost surely, 2^66891948 is an apocalyptic number.

It is an amenable number.

66891948 is an abundant number, since it is smaller than the sum of its proper divisors (89516052).

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

66891948 is a wasteful number, since it uses less digits than its factorization.

66891948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11677 (or 11675 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 66891948 is about 8178.7497822100. The cubic root of 66891948 is about 405.9363550570.

The spelling of 66891948 in words is "sixty-six million, eight hundred ninety-one thousand, nine hundred forty-eight".