64033640 has 32 divisors (see below), whose sum is σ = 157174560. Its totient is φ = 23284800.

The previous prime is 64033621. The next prime is 64033657. The reversal of 64033640 is 4633046.

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, 72326 + ... + 73205.

It is an arithmetic number, because the mean of its divisors is an integer number (4911705).

Almost surely, 2^64033640 is an apocalyptic number.

It is an amenable number.

64033640 is an abundant number, since it is smaller than the sum of its proper divisors (93140920).

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

64033640 is a wasteful number, since it uses less digits than its factorization.

64033640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145553 (or 145549 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 64033640 is about 8002.1022237909. The cubic root of 64033640 is about 400.0700710577.

Adding to 64033640 its reverse (4633046), we get a palindrome (68666686).

It can be divided in two parts, 640 and 33640, that multiplied together give a square (21529600 = 4640²).

The spelling of 64033640 in words is "sixty-four million, thirty-three thousand, six hundred forty".