491648436 has 18 divisors (see below), whose sum is σ = 1242778082. Its totient is φ = 163882800.

The previous prime is 491648419. The next prime is 491648441. The reversal of 491648436 is 634846194.

It can be written as a sum of positive squares in only one way, i.e., 483560100 + 8088336 = 21990^2 + 2844^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 491648391 and 491648400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6828415 + ... + 6828486.

Almost surely, 2^491648436 is an apocalyptic number.

It is an amenable number.

491648436 is an abundant number, since it is smaller than the sum of its proper divisors (751129646).

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

491648436 is a wasteful number, since it uses less digits than its factorization.

491648436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13656911 (or 13656906 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 491648436 is about 22173.1467320270. The cubic root of 491648436 is about 789.2565970385.

It can be divided in two parts, 49164 and 8436, that added together give a square (57600 = 240²).

The spelling of 491648436 in words is "four hundred ninety-one million, six hundred forty-eight thousand, four hundred thirty-six".