649971402 has 16 divisors (see below), whose sum is σ = 1330174560. Its totient is φ = 211618512.

The previous prime is 649971391. The next prime is 649971431. The reversal of 649971402 is 204179946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1259377 + ... + 1259892.

It is an arithmetic number, because the mean of its divisors is an integer number (83135910).

Almost surely, 2^649971402 is an apocalyptic number.

649971402 is an abundant number, since it is smaller than the sum of its proper divisors (680203158).

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

649971402 is a wasteful number, since it uses less digits than its factorization.

649971402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519317.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 649971402 is about 25494.5367088716. The cubic root of 649971402 is about 866.2264012028.

The spelling of 649971402 in words is "six hundred forty-nine million, nine hundred seventy-one thousand, four hundred two".