764441891 has 2 divisors, whose sum is σ = 764441892. Its totient is φ = 764441890.

The previous prime is 764441837. The next prime is 764441903. The reversal of 764441891 is 198144467.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 764441891 - 2¹⁴ = 764425507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (764441291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382220945 + 382220946.

It is an arithmetic number, because the mean of its divisors is an integer number (382220946).

Almost surely, 2^764441891 is an apocalyptic number.

764441891 is a deficient number, since it is larger than the sum of its proper divisors (1).

764441891 is an equidigital number, since it uses as much as digits as its factorization.

764441891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 764441891 is about 27648.5422943055. The cubic root of 764441891 is about 914.3549619856.

The spelling of 764441891 in words is "seven hundred sixty-four million, four hundred forty-one thousand, eight hundred ninety-one".