781680676 has 24 divisors (see below), whose sum is σ = 1592861760. Its totient is φ = 328684512.

The previous prime is 781680659. The next prime is 781680701. The reversal of 781680676 is 676086187.

It is a super-2 number, since 2×781680676² = 1222049358463633952, which contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261886 + ... + 264853.

It is an arithmetic number, because the mean of its divisors is an integer number (66369240).

Almost surely, 2^781680676 is an apocalyptic number.

It is an amenable number.

781680676 is an abundant number, since it is smaller than the sum of its proper divisors (811181084).

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

781680676 is a wasteful number, since it uses less digits than its factorization.

781680676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526803 (or 526801 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 781680676 is about 27958.5528237783. The cubic root of 781680676 is about 921.1770834589.

The spelling of 781680676 in words is "seven hundred eighty-one million, six hundred eighty thousand, six hundred seventy-six".