65855988 has 36 divisors (see below), whose sum is σ = 181603968. Its totient is φ = 19956240.

The previous prime is 65855987. The next prime is 65856017. The reversal of 65855988 is 88955856.

65855988 is a `hidden beast` number, since 6 + 5 + 8 + 559 + 88 = 666.

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

It is a super-2 number, since 2×65855988² = 8674022310912288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65855983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82756 + ... + 83547.

Almost surely, 2^65855988 is an apocalyptic number.

It is an amenable number.

65855988 is an abundant number, since it is smaller than the sum of its proper divisors (115747980).

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

65855988 is a wasteful number, since it uses less digits than its factorization.

65855988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166324 (or 166319 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 54.

The square root of 65855988 is about 8115.1702385101. The cubic root of 65855988 is about 403.8298551580.

The spelling of 65855988 in words is "sixty-five million, eight hundred fifty-five thousand, nine hundred eighty-eight".