1643627948 has 6 divisors (see below), whose sum is σ = 2876348916. Its totient is φ = 821813972.

The previous prime is 1643627939. The next prime is 1643627969. The reversal of 1643627948 is 8497263461.

It is a junction number, because it is equal to n+sod(n) for n = 1643627896 and 1643627905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205453490 + ... + 205453497.

It is an arithmetic number, because the mean of its divisors is an integer number (479391486).

Almost surely, 2^1643627948 is an apocalyptic number.

It is an amenable number.

1643627948 is a deficient number, since it is larger than the sum of its proper divisors (1232720968).

1643627948 is a wasteful number, since it uses less digits than its factorization.

1643627948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410906991 (or 410906989 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The square root of 1643627948 is about 40541.6816128784. The cubic root of 1643627948 is about 1180.1426496126.

The spelling of 1643627948 in words is "one billion, six hundred forty-three million, six hundred twenty-seven thousand, nine hundred forty-eight".