64687040 has 224 divisors, whose sum is σ = 189609984. Its totient is φ = 20725760.

The previous prime is 64687037. The next prime is 64687079. The reversal of 64687040 is 4078646.

64687040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1376297 + ... + 1376343.

Almost surely, 2^64687040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64687040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94804992).

64687040 is an abundant number, since it is smaller than the sum of its proper divisors (124922944).

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

64687040 is a wasteful number, since it uses less digits than its factorization.

64687040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 64687040 is about 8042.8253742077. The cubic root of 64687040 is about 401.4262418744.

The spelling of 64687040 in words is "sixty-four million, six hundred eighty-seven thousand, forty".