66997896 has 96 divisors (see below), whose sum is σ = 203394240. Its totient is φ = 18302592.

The previous prime is 66997871. The next prime is 66997921. The reversal of 66997896 is 69879966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66997871) and next prime (66997921).

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, 25810 + ... + 28286.

It is an arithmetic number, because the mean of its divisors is an integer number (2118690).

Almost surely, 2^66997896 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 66997896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101697120).

66997896 is an abundant number, since it is smaller than the sum of its proper divisors (136396344).

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

66997896 is a wasteful number, since it uses less digits than its factorization.

66997896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523 (or 2512 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 60.

The square root of 66997896 is about 8185.2242486080. The cubic root of 66997896 is about 406.1505585089.

The spelling of 66997896 in words is "sixty-six million, nine hundred ninety-seven thousand, eight hundred ninety-six".