1643251460 has 24 divisors (see below), whose sum is σ = 3473687616. Its totient is φ = 652946400.

The previous prime is 1643251457. The next prime is 1643251469. The reversal of 1643251460 is 641523461.

It is not an unprimeable number, because it can be changed into a prime (1643251469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269042 + ... + 275081.

It is an arithmetic number, because the mean of its divisors is an integer number (144736984).

Almost surely, 2^1643251460 is an apocalyptic number.

1643251460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643251460 is an abundant number, since it is smaller than the sum of its proper divisors (1830436156).

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

1643251460 is a wasteful number, since it uses less digits than its factorization.

1643251460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544283 (or 544281 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1643251460 is about 40537.0381256450. The cubic root of 1643251460 is about 1180.0525352460.

The spelling of 1643251460 in words is "one billion, six hundred forty-three million, two hundred fifty-one thousand, four hundred sixty".