646551942 has 32 divisors (see below), whose sum is σ = 1351703808. Its totient is φ = 205783776.

The previous prime is 646551937. The next prime is 646551953. The reversal of 646551942 is 249155646.

It is a junction number, because it is equal to n+sod(n) for n = 646551894 and 646551903.

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 15 ways as a sum of consecutive naturals, for example, 80773 + ... + 88415.

It is an arithmetic number, because the mean of its divisors is an integer number (42240744).

Almost surely, 2^646551942 is an apocalyptic number.

646551942 is an abundant number, since it is smaller than the sum of its proper divisors (705151866).

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

646551942 is a wasteful number, since it uses less digits than its factorization.

646551942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284.

The product of its digits is 259200, while the sum is 42.

The square root of 646551942 is about 25427.3856697852. The cubic root of 646551942 is about 864.7046747068.

The spelling of 646551942 in words is "six hundred forty-six million, five hundred fifty-one thousand, nine hundred forty-two".