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649636 = 22132312
BaseRepresentation
bin10011110100110100100
31020000010121
42132212210
5131242021
621531324
75343661
oct2364644
91200117
10649636
11404099
12273b44
13199900
1412ca68
15cc741
hex9e9a4

649636 has 27 divisors (see below), whose sum is σ = 1272033. Its totient is φ = 290160.

The previous prime is 649633. The next prime is 649639. The reversal of 649636 is 636946.

The square root of 649636 is 806.

It is a perfect power (a square), and thus also a powerful number.

649636 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 (649633) and next prime (649639).

It can be written as a sum of positive squares in only one way, i.e., 96100 + 553536 = 310^2 + 744^2 .

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (649631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20941 + ... + 20971.

2649636 is an apocalyptic number.

649636 is the 806-th square number.

It is an amenable number.

649636 is a deficient number, since it is larger than the sum of its proper divisors (622397).

649636 is a wasteful number, since it uses less digits than its factorization.

649636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 46 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The cubic root of 649636 is about 86.6077377182.

The spelling of 649636 in words is "six hundred forty-nine thousand, six hundred thirty-six".

Divisors: 1 2 4 13 26 31 52 62 124 169 338 403 676 806 961 1612 1922 3844 5239 10478 12493 20956 24986 49972 162409 324818 649636