643102740 has 120 divisors (see below), whose sum is σ = 2305683072. Its totient is φ = 146992320.

The previous prime is 643102723. The next prime is 643102751. The reversal of 643102740 is 47201346.

643102740 is a `hidden beast` number, since 643 + 10 + 2 + 7 + 4 + 0 = 666.

It is a super-2 number, since 2×643102740² = 827162268391015200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17016 + ... + 39695.

Almost surely, 2^643102740 is an apocalyptic number.

643102740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643102740 is an abundant number, since it is smaller than the sum of its proper divisors (1662580332).

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

643102740 is a wasteful number, since it uses less digits than its factorization.

643102740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56739 (or 56728 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 643102740 is about 25359.4704203380. The cubic root of 643102740 is about 863.1642671015.

The spelling of 643102740 in words is "six hundred forty-three million, one hundred two thousand, seven hundred forty".