64536420 has 192 divisors, whose sum is σ = 214050816. Its totient is φ = 14376960.

The previous prime is 64536391. The next prime is 64536463. The reversal of 64536420 is 2463546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 410982 + ... + 411138.

It is an arithmetic number, because the mean of its divisors is an integer number (1114848).

Almost surely, 2^64536420 is an apocalyptic number.

64536420 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 64536420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107025408).

64536420 is an abundant number, since it is smaller than the sum of its proper divisors (149514396).

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

64536420 is a wasteful number, since it uses less digits than its factorization.

64536420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 64536420 is about 8033.4562922817. The cubic root of 64536420 is about 401.1144338760.

Adding to 64536420 its reverse (2463546), we get a palindrome (66999966).

The spelling of 64536420 in words is "sixty-four million, five hundred thirty-six thousand, four hundred twenty".