769640407 has 4 divisors (see below), whose sum is σ = 776833416. Its totient is φ = 762447400.

The previous prime is 769640383. The next prime is 769640419. The reversal of 769640407 is 704046967.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-769640407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769610407) 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, 3596344 + ... + 3596557.

It is an arithmetic number, because the mean of its divisors is an integer number (194208354).

Almost surely, 2^769640407 is an apocalyptic number.

769640407 is a deficient number, since it is larger than the sum of its proper divisors (7193009).

769640407 is a wasteful number, since it uses less digits than its factorization.

769640407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193008.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 769640407 is about 27742.3936782679. The cubic root of 769640407 is about 916.4229433074.

The spelling of 769640407 in words is "seven hundred sixty-nine million, six hundred forty thousand, four hundred seven".