65138502 has 96 divisors (see below), whose sum is σ = 160151040. Its totient is φ = 17409600.

The previous prime is 65138429. The next prime is 65138519. The reversal of 65138502 is 20583156.

It is a self number, because there is not a number n which added to its sum of digits gives 65138502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 824499 + ... + 824577.

It is an arithmetic number, because the mean of its divisors is an integer number (1668240).

Almost surely, 2^65138502 is an apocalyptic number.

65138502 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 65138502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80075520).

65138502 is an abundant number, since it is smaller than the sum of its proper divisors (95012538).

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

65138502 is a wasteful number, since it uses less digits than its factorization.

65138502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 65138502 is about 8070.8427069297. The cubic root of 65138502 is about 402.3579520098.

The spelling of 65138502 in words is "sixty-five million, one hundred thirty-eight thousand, five hundred two".