64533400 has 48 divisors (see below), whose sum is σ = 156574800. Its totient is φ = 24689280.

The previous prime is 64533389. The next prime is 64533407. The reversal of 64533400 is 433546.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64533407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2415 + ... + 11614.

It is an arithmetic number, because the mean of its divisors is an integer number (3261975).

Almost surely, 2^64533400 is an apocalyptic number.

It is an amenable number.

64533400 is an abundant number, since it is smaller than the sum of its proper divisors (92041400).

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

64533400 is a wasteful number, since it uses less digits than its factorization.

64533400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14068 (or 14059 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 64533400 is about 8033.2683261547. The cubic root of 64533400 is about 401.1081770240.

Adding to 64533400 its reverse (433546), we get a palindrome (64966946).

The spelling of 64533400 in words is "sixty-four million, five hundred thirty-three thousand, four hundred".