649289466 has 128 divisors (see below), whose sum is σ = 1769472000. Its totient is φ = 172253952.

The previous prime is 649289437. The next prime is 649289467. The reversal of 649289466 is 664982946.

649289466 is a `hidden beast` number, since 6 + 492 + 8 + 94 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (649289467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 507015 + ... + 508293.

It is an arithmetic number, because the mean of its divisors is an integer number (13824000).

Almost surely, 2^649289466 is an apocalyptic number.

649289466 is the 16116-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649289466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884736000).

649289466 is an abundant number, since it is smaller than the sum of its proper divisors (1120182534).

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

649289466 is a wasteful number, since it uses less digits than its factorization.

649289466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1387 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 649289466 is about 25481.1590395727. The cubic root of 649289466 is about 865.9233531647.

The spelling of 649289466 in words is "six hundred forty-nine million, two hundred eighty-nine thousand, four hundred sixty-six".