1643762540 has 24 divisors (see below), whose sum is σ = 3945030432. Its totient is φ = 563575680.

The previous prime is 1643762531. The next prime is 1643762557. The reversal of 1643762540 is 452673461.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1643762494 and 1643762503.

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, 5870441 + ... + 5870720.

It is an arithmetic number, because the mean of its divisors is an integer number (164376268).

Almost surely, 2^1643762540 is an apocalyptic number.

1643762540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643762540 is an abundant number, since it is smaller than the sum of its proper divisors (2301267892).

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

1643762540 is a wasteful number, since it uses less digits than its factorization.

1643762540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11741177 (or 11741175 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 1643762540 is about 40543.3415001773. The cubic root of 1643762540 is about 1180.1748615708.

The spelling of 1643762540 in words is "one billion, six hundred forty-three million, seven hundred sixty-two thousand, five hundred forty".