66900000 has 144 divisors (see below), whose sum is σ = 220485888. Its totient is φ = 17760000.

The previous prime is 66899999. The next prime is 66900017. The reversal of 66900000 is 966.

It is a super-2 number, since 2×66900000² = 8951220000000000, 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 66900000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299889 + ... + 300111.

It is an arithmetic number, because the mean of its divisors is an integer number (1531152).

Almost surely, 2^66900000 is an apocalyptic number.

66900000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110242944).

66900000 is an abundant number, since it is smaller than the sum of its proper divisors (153585888).

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

66900000 is an equidigital number, since it uses as much as digits as its factorization.

66900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 66900000 is about 8179.2420186714. The cubic root of 66900000 is about 405.9526423606.

Adding to 66900000 its reverse (966), we get a palindrome (66900966).

The spelling of 66900000 in words is "sixty-six million, nine hundred thousand".