64140672 has 32 divisors (see below), whose sum is σ = 170374680. Its totient is φ = 21380096.

The previous prime is 64140667. The next prime is 64140679. The reversal of 64140672 is 27604146.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×64140672³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64140679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83133 + ... + 83900.

Almost surely, 2^64140672 is an apocalyptic number.

It is an amenable number.

64140672 is an abundant number, since it is smaller than the sum of its proper divisors (106234008).

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

64140672 is a wasteful number, since it uses less digits than its factorization.

64140672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167050 (or 167038 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 64140672 is about 8008.7871740982. The cubic root of 64140672 is about 400.2928522083.

The spelling of 64140672 in words is "sixty-four million, one hundred forty thousand, six hundred seventy-two".