64233640 has 32 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 25582144.

The previous prime is 64233619. The next prime is 64233709. The reversal of 64233640 is 4633246.

It is a junction number, because it is equal to n+sod(n) for n = 64233599 and 64233608.

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, 6201 + ... + 12919.

It is an arithmetic number, because the mean of its divisors is an integer number (4536000).

Almost surely, 2^64233640 is an apocalyptic number.

It is an amenable number.

64233640 is an abundant number, since it is smaller than the sum of its proper divisors (80918360).

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

64233640 is a wasteful number, since it uses less digits than its factorization.

64233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6969 (or 6965 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 64233640 is about 8014.5891972078. The cubic root of 64233640 is about 400.4861588845.

Adding to 64233640 its reverse (4633246), we get a palindrome (68866886).

The spelling of 64233640 in words is "sixty-four million, two hundred thirty-three thousand, six hundred forty".