1641264 has 40 divisors (see below), whose sum is σ = 4380672. Its totient is φ = 528960.

The previous prime is 1641253. The next prime is 1641281. The reversal of 1641264 is 4621461.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937 + ... + 2039.

2^1641264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190336).

1641264 is an abundant number, since it is smaller than the sum of its proper divisors (2739408).

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

1641264 is a wasteful number, since it uses less digits than its factorization.

1641264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1139 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 1641264 is about 1281.1182615200. The cubic root of 1641264 is about 117.9576598071.

1641264 divided by its sum of digits (24) gives a palindrome (68386).

The spelling of 1641264 in words is "one million, six hundred forty-one thousand, two hundred sixty-four".