769978641 has 4 divisors (see below), whose sum is σ = 1026638192. Its totient is φ = 513319092.

The previous prime is 769978631. The next prime is 769978679. The reversal of 769978641 is 146879967.

769978641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 769978641 - 2⁶ = 769978577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (769978631) 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, 128329771 + ... + 128329776.

It is an arithmetic number, because the mean of its divisors is an integer number (256659548).

Almost surely, 2^769978641 is an apocalyptic number.

It is an amenable number.

769978641 is a deficient number, since it is larger than the sum of its proper divisors (256659551).

769978641 is a wasteful number, since it uses less digits than its factorization.

769978641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256659550.

The product of its digits is 4572288, while the sum is 57.

The square root of 769978641 is about 27748.4889858889. The cubic root of 769978641 is about 916.5571704951.

The spelling of 769978641 in words is "seven hundred sixty-nine million, nine hundred seventy-eight thousand, six hundred forty-one".