65997808 has 20 divisors (see below), whose sum is σ = 135393120. Its totient is φ = 31057664.

The previous prime is 65997793. The next prime is 65997821. The reversal of 65997808 is 80879956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121048 + ... + 121591.

It is an arithmetic number, because the mean of its divisors is an integer number (6769656).

Almost surely, 2^65997808 is an apocalyptic number.

65997808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65997808 is an abundant number, since it is smaller than the sum of its proper divisors (69395312).

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

65997808 is a wasteful number, since it uses less digits than its factorization.

65997808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242664 (or 242658 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 65997808 is about 8123.9034952417. The cubic root of 65997808 is about 404.1195280742.

The spelling of 65997808 in words is "sixty-five million, nine hundred ninety-seven thousand, eight hundred eight".