771694644 has 48 divisors (see below), whose sum is σ = 2113478528. Its totient is φ = 214524288.

The previous prime is 771694631. The next prime is 771694663. The reversal of 771694644 is 446496177.

It is a junction number, because it is equal to n+sod(n) for n = 771694593 and 771694602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121039 + ... + 127254.

Almost surely, 2^771694644 is an apocalyptic number.

771694644 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

771694644 is an abundant number, since it is smaller than the sum of its proper divisors (1341783884).

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

771694644 is a wasteful number, since it uses less digits than its factorization.

771694644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248344 (or 248342 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The square root of 771694644 is about 27779.3924339608. The cubic root of 771694644 is about 917.2375564192.

The spelling of 771694644 in words is "seven hundred seventy-one million, six hundred ninety-four thousand, six hundred forty-four".