765138601 has 8 divisors (see below), whose sum is σ = 813303720. Its totient is φ = 717324288.

The previous prime is 765138599. The next prime is 765138613. The reversal of 765138601 is 106831567.

It can be written as a sum of positive squares in 4 ways, for example, as 517107600 + 248031001 = 22740^2 + 15749^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 765138601 - 2¹ = 765138599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765132601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83196 + ... + 91933.

It is an arithmetic number, because the mean of its divisors is an integer number (101662965).

Almost surely, 2^765138601 is an apocalyptic number.

It is an amenable number.

765138601 is a deficient number, since it is larger than the sum of its proper divisors (48165119).

765138601 is a wasteful number, since it uses less digits than its factorization.

765138601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175403.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 765138601 is about 27661.1388232661. The cubic root of 765138601 is about 914.6326577437.

The spelling of 765138601 in words is "seven hundred sixty-five million, one hundred thirty-eight thousand, six hundred one".