771390864 has 120 divisors (see below), whose sum is σ = 2252286400. Its totient is φ = 255581568.

The previous prime is 771390791. The next prime is 771390871. The reversal of 771390864 is 468093177.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 773214 + ... + 774210.

Almost surely, 2^771390864 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 771390864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1126143200).

771390864 is an abundant number, since it is smaller than the sum of its proper divisors (1480895536).

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

771390864 is a wasteful number, since it uses less digits than its factorization.

771390864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 771390864 is about 27773.9241735841. The cubic root of 771390864 is about 917.1171828157.

The spelling of 771390864 in words is "seven hundred seventy-one million, three hundred ninety thousand, eight hundred sixty-four".