306640642 has 64 divisors (see below), whose sum is σ = 589400064. Its totient is φ = 116202240.

The previous prime is 306640637. The next prime is 306640651. The reversal of 306640642 is 246046603.

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 31 ways as a sum of consecutive naturals, for example, 1165803 + ... + 1166065.

It is an arithmetic number, because the mean of its divisors is an integer number (9209376).

Almost surely, 2^306640642 is an apocalyptic number.

306640642 is a deficient number, since it is larger than the sum of its proper divisors (282759422).

306640642 is a wasteful number, since it uses less digits than its factorization.

306640642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 306640642 is about 17511.1576430572. The cubic root of 306640642 is about 674.3363514753.

The spelling of 306640642 in words is "three hundred six million, six hundred forty thousand, six hundred forty-two".