65638012 has 12 divisors (see below), whose sum is σ = 125309016. Its totient is φ = 29835440.

The previous prime is 65637997. The next prime is 65638033. The reversal of 65638012 is 21083656.

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, 745843 + ... + 745930.

It is an arithmetic number, because the mean of its divisors is an integer number (10442418).

Almost surely, 2^65638012 is an apocalyptic number.

It is an amenable number.

65638012 is a deficient number, since it is larger than the sum of its proper divisors (59671004).

65638012 is a wasteful number, since it uses less digits than its factorization.

65638012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491788 (or 1491786 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 65638012 is about 8101.7289512795. The cubic root of 65638012 is about 403.3838187076.

The spelling of 65638012 in words is "sixty-five million, six hundred thirty-eight thousand, twelve".