6401564 has 24 divisors (see below), whose sum is σ = 12133968. Its totient is φ = 2937600.

The previous prime is 6401557. The next prime is 6401569. The reversal of 6401564 is 4651046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15764 + ... + 16164.

It is an arithmetic number, because the mean of its divisors is an integer number (505582).

Almost surely, 2^6401564 is an apocalyptic number.

It is an amenable number.

6401564 is a deficient number, since it is larger than the sum of its proper divisors (5732404).

6401564 is a wasteful number, since it uses less digits than its factorization.

6401564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 6401564 is about 2530.1312218934. The cubic root of 6401564 is about 185.6786759563.

The spelling of 6401564 in words is "six million, four hundred one thousand, five hundred sixty-four".