65991828 has 48 divisors (see below), whose sum is σ = 179580800. Its totient is φ = 18853632.

The previous prime is 65991823. The next prime is 65991829. The reversal of 65991828 is 82819956.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65991823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3901 + ... + 12132.

Almost surely, 2^65991828 is an apocalyptic number.

It is an amenable number.

65991828 is an abundant number, since it is smaller than the sum of its proper divisors (113588972).

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

65991828 is a wasteful number, since it uses less digits than its factorization.

65991828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16061 (or 16045 counting only the distinct ones).

The product of its digits is 311040, while the sum is 48.

The square root of 65991828 is about 8123.5354372342. The cubic root of 65991828 is about 404.1073220741.

The spelling of 65991828 in words is "sixty-five million, nine hundred ninety-one thousand, eight hundred twenty-eight".