769720321 has 4 divisors (see below), whose sum is σ = 781208752. Its totient is φ = 758231892.

The previous prime is 769720307. The next prime is 769720331. The reversal of 769720321 is 123027967.

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 769720321 - 2¹⁹ = 769196033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (769720331) 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, 5744115 + ... + 5744248.

It is an arithmetic number, because the mean of its divisors is an integer number (195302188).

It is a Proth number, since it is equal to 11745 ⋅ 2¹⁶ + 1 and 11745 < 2¹⁶.

Almost surely, 2^769720321 is an apocalyptic number.

It is an amenable number.

769720321 is a deficient number, since it is larger than the sum of its proper divisors (11488431).

769720321 is a wasteful number, since it uses less digits than its factorization.

769720321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11488430.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 769720321 is about 27743.8339275595. The cubic root of 769720321 is about 916.4546604954.

The spelling of 769720321 in words is "seven hundred sixty-nine million, seven hundred twenty thousand, three hundred twenty-one".