649179450 has 36 divisors (see below), whose sum is σ = 1744129998. Its totient is φ = 173114400.

The previous prime is 649179449. The next prime is 649179451. The reversal of 649179450 is 54971946.

649179450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (649179449) and next prime (649179451).

It can be written as a sum of positive squares in 3 ways, for example, as 598242681 + 50936769 = 24459^2 + 7137^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 649179396 and 649179405.

It is not an unprimeable number, because it can be changed into a prime (649179451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 720861 + ... + 721760.

Almost surely, 2^649179450 is an apocalyptic number.

649179450 is an abundant number, since it is smaller than the sum of its proper divisors (1094950548).

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

649179450 is a wasteful number, since it uses less digits than its factorization.

649179450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442639 (or 1442631 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 649179450 is about 25479.0001766160. Note that the first 3 decimals coincide. The cubic root of 649179450 is about 865.8744428765.

The spelling of 649179450 in words is "six hundred forty-nine million, one hundred seventy-nine thousand, four hundred fifty".