646738142 has 8 divisors (see below), whose sum is σ = 990747936. Its totient is φ = 316488832.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738142 is 241837646.

646738142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×646738142² = 836540448635224328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646738142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3440003 + ... + 3440190.

It is an arithmetic number, because the mean of its divisors is an integer number (123843492).

Almost surely, 2^646738142 is an apocalyptic number.

646738142 is a deficient number, since it is larger than the sum of its proper divisors (344009794).

646738142 is a wasteful number, since it uses less digits than its factorization.

646738142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880242.

The product of its digits is 193536, while the sum is 41.

The square root of 646738142 is about 25431.0468129017. The cubic root of 646738142 is about 864.7876752859.

The spelling of 646738142 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred forty-two".