648671556 has 24 divisors (see below), whose sum is σ = 1629995584. Its totient is φ = 199591200.

The previous prime is 648671519. The next prime is 648671563. The reversal of 648671556 is 655176846.

It is a super-2 number, since 2×648671556² = 841549575126922272, which contains 22 as substring.

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, 2078920 + ... + 2079231.

Almost surely, 2^648671556 is an apocalyptic number.

It is an amenable number.

648671556 is an abundant number, since it is smaller than the sum of its proper divisors (981324028).

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

648671556 is a wasteful number, since it uses less digits than its factorization.

648671556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158171 (or 4158169 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 648671556 is about 25469.0313125568. The cubic root of 648671556 is about 865.6485745790.

The spelling of 648671556 in words is "six hundred forty-eight million, six hundred seventy-one thousand, five hundred fifty-six".