771122664 has 144 divisors (see below), whose sum is σ = 2283840000. Its totient is φ = 234928512.

The previous prime is 771122659. The next prime is 771122687. The reversal of 771122664 is 466221177.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1545087 + ... + 1545585.

It is an arithmetic number, because the mean of its divisors is an integer number (15860000).

Almost surely, 2^771122664 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 771122664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141920000).

771122664 is an abundant number, since it is smaller than the sum of its proper divisors (1512717336).

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

771122664 is a wasteful number, since it uses less digits than its factorization.

771122664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 644 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 771122664 is about 27769.0954840088. The cubic root of 771122664 is about 917.0108816083.

The spelling of 771122664 in words is "seven hundred seventy-one million, one hundred twenty-two thousand, six hundred sixty-four".