64869040 has 40 divisors (see below), whose sum is σ = 158762160. Its totient is φ = 24581376.

The previous prime is 64869031. The next prime is 64869043. The reversal of 64869040 is 4096846.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (64869043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19819 + ... + 22858.

It is an arithmetic number, because the mean of its divisors is an integer number (3969054).

Almost surely, 2^64869040 is an apocalyptic number.

It is an amenable number.

64869040 is an abundant number, since it is smaller than the sum of its proper divisors (93893120).

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

64869040 is a wasteful number, since it uses less digits than its factorization.

64869040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42709 (or 42703 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 64869040 is about 8054.1318588660. The cubic root of 64869040 is about 401.8023664896.

The spelling of 64869040 in words is "sixty-four million, eight hundred sixty-nine thousand, forty".