66899376 has 60 divisors (see below), whose sum is σ = 187868928. Its totient is φ = 22223232.

The previous prime is 66899359. The next prime is 66899401. The reversal of 66899376 is 67399866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54546 + ... + 55758.

Almost surely, 2^66899376 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 66899376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93934464).

66899376 is an abundant number, since it is smaller than the sum of its proper divisors (120969552).

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

66899376 is a wasteful number, since it uses less digits than its factorization.

66899376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1601 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 66899376 is about 8179.2038732385. The cubic root of 66899376 is about 405.9513802019.

The spelling of 66899376 in words is "sixty-six million, eight hundred ninety-nine thousand, three hundred seventy-six".