781693056 has 48 divisors (see below), whose sum is σ = 2249406510. Its totient is φ = 260563968.

The previous prime is 781693037. The next prime is 781693091. The reversal of 781693056 is 650396187.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 749883456 + 31809600 = 27384^2 + 5640^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×781693056² = 1222088067597238272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338125 + ... + 340428.

Almost surely, 2^781693056 is an apocalyptic number.

It is an amenable number.

781693056 is an abundant number, since it is smaller than the sum of its proper divisors (1467713454).

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

781693056 is a wasteful number, since it uses less digits than its factorization.

781693056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678573 (or 678558 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 781693056 is about 27958.7742220577. The cubic root of 781693056 is about 921.1819465325.

It can be divided in two parts, 78169 and 3056, that added together give a square (81225 = 285²).

The spelling of 781693056 in words is "seven hundred eighty-one million, six hundred ninety-three thousand, fifty-six".