65139768 has 64 divisors (see below), whose sum is σ = 182868000. Its totient is φ = 21482496.

The previous prime is 65139757. The next prime is 65139779. The reversal of 65139768 is 86793156.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65139757) and next prime (65139779).

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, 19398 + ... + 22506.

Almost surely, 2^65139768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65139768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91434000).

65139768 is an abundant number, since it is smaller than the sum of its proper divisors (117728232).

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

65139768 is a wasteful number, since it uses less digits than its factorization.

65139768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221 (or 3211 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 65139768 is about 8070.9211370202. The cubic root of 65139768 is about 402.3605586703.

The spelling of 65139768 in words is "sixty-five million, one hundred thirty-nine thousand, seven hundred sixty-eight".