769644666 has 176 divisors, whose sum is σ = 2125752000. Its totient is φ = 208324872.

The previous prime is 769644613. The next prime is 769644671. The reversal of 769644666 is 666446967.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (7838208) is a multiple of the sum of its prime factors (72).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 87 ways as a sum of consecutive naturals, for example, 40507605 + ... + 40507623.

Almost surely, 2^769644666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 769644666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062876000).

769644666 is an abundant number, since it is smaller than the sum of its proper divisors (1356107334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

769644666 is an frugal number, since it uses more digits than its factorization.

769644666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 31 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

The square root of 769644666 is about 27742.4704379405. The cubic root of 769644666 is about 916.4246337237.

The spelling of 769644666 in words is "seven hundred sixty-nine million, six hundred forty-four thousand, six hundred sixty-six".