6453640 has 16 divisors (see below), whose sum is σ = 14520780. Its totient is φ = 2581440.

The previous prime is 6453571. The next prime is 6453647. The reversal of 6453640 is 463546.

It can be written as a sum of positive squares in 2 ways, for example, as 5943844 + 509796 = 2438^2 + 714^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6453599 and 6453608.

It is not an unprimeable number, because it can be changed into a prime (6453647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80631 + ... + 80710.

Almost surely, 2^6453640 is an apocalyptic number.

It is an amenable number.

6453640 is an abundant number, since it is smaller than the sum of its proper divisors (8067140).

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

6453640 is a wasteful number, since it uses less digits than its factorization.

6453640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161352 (or 161348 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6453640 is about 2540.4015430636. The cubic root of 6453640 is about 186.1808084953.

The spelling of 6453640 in words is "six million, four hundred fifty-three thousand, six hundred forty".