1957621648 has 20 divisors (see below), whose sum is σ = 3812755968. Its totient is φ = 973684640.

The previous prime is 1957621643. The next prime is 1957621663. The reversal of 1957621648 is 8461267591.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1957621643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317236 + ... + 323347.

Almost surely, 2^1957621648 is an apocalyptic number.

It is an amenable number.

1957621648 is a deficient number, since it is larger than the sum of its proper divisors (1855134320).

1957621648 is a wasteful number, since it uses less digits than its factorization.

1957621648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640782 (or 640776 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 1957621648 is about 44245.0183410517. The cubic root of 1957621648 is about 1250.9585496648.

The spelling of 1957621648 in words is "one billion, nine hundred fifty-seven million, six hundred twenty-one thousand, six hundred forty-eight".