65999628 has 36 divisors (see below), whose sum is σ = 169985088. Its totient is φ = 21584160.

The previous prime is 65999599. The next prime is 65999639. The reversal of 65999628 is 82699956.

65999628 is a `hidden beast` number, since 6 + 5 + 9 + 9 + 9 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×65999628² = 8711901792276768, which contains 22 as substring.

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, 15388 + ... + 19203.

It is an arithmetic number, because the mean of its divisors is an integer number (4721808).

Almost surely, 2^65999628 is an apocalyptic number.

It is an amenable number.

65999628 is an abundant number, since it is smaller than the sum of its proper divisors (103985460).

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

65999628 is a wasteful number, since it uses less digits than its factorization.

65999628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34654 (or 34649 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 65999628 is about 8124.0155095864. The cubic root of 65999628 is about 404.1232427975.

The spelling of 65999628 in words is "sixty-five million, nine hundred ninety-nine thousand, six hundred twenty-eight".