840736648 has 16 divisors (see below), whose sum is σ = 1602224460. Its totient is φ = 413476800.

The previous prime is 840736627. The next prime is 840736679. The reversal of 840736648 is 846637048.

It can be written as a sum of positive squares in 2 ways, for example, as 836250724 + 4485924 = 28918^2 + 2118^2 .

It is a super-2 number, since 2×840736648² = 1413676222580551808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840736598 and 840736607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860923 + ... + 861898.

Almost surely, 2^840736648 is an apocalyptic number.

It is an amenable number.

840736648 is a deficient number, since it is larger than the sum of its proper divisors (761487812).

840736648 is a wasteful number, since it uses less digits than its factorization.

840736648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722888 (or 1722884 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The square root of 840736648 is about 28995.4590927614. The cubic root of 840736648 is about 943.8145313358.

The spelling of 840736648 in words is "eight hundred forty million, seven hundred thirty-six thousand, six hundred forty-eight".