64504020 has 96 divisors (see below), whose sum is σ = 208454400. Its totient is φ = 14598144.

The previous prime is 64504003. The next prime is 64504057. The reversal of 64504020 is 2040546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 45076 + ... + 46484.

It is an arithmetic number, because the mean of its divisors is an integer number (2171400).

Almost surely, 2^64504020 is an apocalyptic number.

64504020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64504020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104227200).

64504020 is an abundant number, since it is smaller than the sum of its proper divisors (143950380).

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

64504020 is a wasteful number, since it uses less digits than its factorization.

64504020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1535 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 64504020 is about 8031.4394724732. The cubic root of 64504020 is about 401.0472971950.

Adding to 64504020 its reverse (2040546), we get a palindrome (66544566).

The spelling of 64504020 in words is "sixty-four million, five hundred four thousand, twenty".