66899448 has 144 divisors (see below), whose sum is σ = 227813040. Its totient is φ = 17360640.

The previous prime is 66899423. The next prime is 66899477. The reversal of 66899448 is 84499866.

It is a super-2 number, since 2×66899448² = 8951072285409408, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 66899394 and 66899403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60436 + ... + 61532.

It is an arithmetic number, because the mean of its divisors is an integer number (1582035).

Almost surely, 2^66899448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66899448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113906520).

66899448 is an abundant number, since it is smaller than the sum of its proper divisors (160913592).

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

66899448 is a wasteful number, since it uses less digits than its factorization.

66899448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1120 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 66899448 is about 8179.2082746437. The cubic root of 66899448 is about 405.9515258360.

The spelling of 66899448 in words is "sixty-six million, eight hundred ninety-nine thousand, four hundred forty-eight".