1646642648 has 48 divisors (see below), whose sum is σ = 3595528080. Its totient is φ = 704918592.

The previous prime is 1646642633. The next prime is 1646642663. The reversal of 1646642648 is 8462466461.

It is an interprime number because it is at equal distance from previous prime (1646642633) and next prime (1646642663).

It is a super-2 number, since 2×1646642648² = 5422864020424903808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473765 + ... + 477227.

It is an arithmetic number, because the mean of its divisors is an integer number (74906835).

Almost surely, 2^1646642648 is an apocalyptic number.

It is an amenable number.

1646642648 is an abundant number, since it is smaller than the sum of its proper divisors (1948885432).

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

1646642648 is a wasteful number, since it uses less digits than its factorization.

1646642648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696 (or 4685 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 47.

The square root of 1646642648 is about 40578.8448332379. The cubic root of 1646642648 is about 1180.8637379973.

The spelling of 1646642648 in words is "one billion, six hundred forty-six million, six hundred forty-two thousand, six hundred forty-eight".