764920261 has 4 divisors (see below), whose sum is σ = 874194592. Its totient is φ = 655645932.

The previous prime is 764920237. The next prime is 764920271. The reversal of 764920261 is 162029467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 764920261 - 2²¹ = 762823109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 764920261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764920271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54637155 + ... + 54637168.

It is an arithmetic number, because the mean of its divisors is an integer number (218548648).

Almost surely, 2^764920261 is an apocalyptic number.

It is an amenable number.

764920261 is a deficient number, since it is larger than the sum of its proper divisors (109274331).

764920261 is a wasteful number, since it uses less digits than its factorization.

764920261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109274330.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 764920261 is about 27657.1918494991. The cubic root of 764920261 is about 914.5456495891.

The spelling of 764920261 in words is "seven hundred sixty-four million, nine hundred twenty thousand, two hundred sixty-one".