65139756 has 48 divisors (see below), whose sum is σ = 168956928. Its totient is φ = 19364800.

The previous prime is 65139751. The next prime is 65139757. The reversal of 65139756 is 65793156.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65139751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2341 + ... + 11651.

It is an arithmetic number, because the mean of its divisors is an integer number (3519936).

Almost surely, 2^65139756 is an apocalyptic number.

65139756 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65139756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84478464).

65139756 is an abundant number, since it is smaller than the sum of its proper divisors (103817172).

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

65139756 is a wasteful number, since it uses less digits than its factorization.

65139756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9382 (or 9380 counting only the distinct ones).

The product of its digits is 170100, while the sum is 42.

The square root of 65139756 is about 8070.9203936106. The cubic root of 65139756 is about 402.3605339627.

The spelling of 65139756 in words is "sixty-five million, one hundred thirty-nine thousand, seven hundred fifty-six".