770669640 has 448 divisors, whose sum is σ = 2974708800. Its totient is φ = 178039296.

The previous prime is 770669639. The next prime is 770669663. The reversal of 770669640 is 46966077.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 7202467 + ... + 7202573.

It is an arithmetic number, because the mean of its divisors is an integer number (6639975).

Almost surely, 2^770669640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 770669640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487354400).

770669640 is an abundant number, since it is smaller than the sum of its proper divisors (2204039160).

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

770669640 is a wasteful number, since it uses less digits than its factorization.

770669640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 770669640 is about 27760.9373040609. The cubic root of 770669640 is about 916.8312693208.

The spelling of 770669640 in words is "seven hundred seventy million, six hundred sixty-nine thousand, six hundred forty".