649561458 has 32 divisors (see below), whose sum is σ = 1598921856. Its totient is φ = 171312768.

The previous prime is 649561457. The next prime is 649561487. The reversal of 649561458 is 854165946.

It is not an unprimeable number, because it can be changed into a prime (649561453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594291 + ... + 595382.

It is an arithmetic number, because the mean of its divisors is an integer number (49966308).

Almost surely, 2^649561458 is an apocalyptic number.

649561458 is an abundant number, since it is smaller than the sum of its proper divisors (949360398).

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

649561458 is a wasteful number, since it uses less digits than its factorization.

649561458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189698.

The product of its digits is 1036800, while the sum is 48.

The square root of 649561458 is about 25486.4956006117. The cubic root of 649561458 is about 866.0442501128.

The spelling of 649561458 in words is "six hundred forty-nine million, five hundred sixty-one thousand, four hundred fifty-eight".