65138590 has 32 divisors (see below), whose sum is σ = 130333536. Its totient is φ = 23237760.

The previous prime is 65138527. The next prime is 65138603. The reversal of 65138590 is 9583156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244 + ... + 11416.

It is an arithmetic number, because the mean of its divisors is an integer number (4072923).

Almost surely, 2^65138590 is an apocalyptic number.

65138590 is an abundant number, since it is smaller than the sum of its proper divisors (65194946).

65138590 is a wasteful number, since it uses less digits than its factorization.

65138590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11244.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 65138590 is about 8070.8481586510. The cubic root of 65138590 is about 402.3581332006.

The spelling of 65138590 in words is "sixty-five million, one hundred thirty-eight thousand, five hundred ninety".