64019988 has 36 divisors (see below), whose sum is σ = 164486868. Its totient is φ = 20989440.

The previous prime is 64019957. The next prime is 64020013. The reversal of 64019988 is 88991046.

64019988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1483524 + 62536464 = 1218^2 + 7908^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 12381 + ... + 16772.

Almost surely, 2^64019988 is an apocalyptic number.

It is an amenable number.

64019988 is an abundant number, since it is smaller than the sum of its proper divisors (100466880).

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

64019988 is a wasteful number, since it uses less digits than its factorization.

64019988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29224 (or 29219 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 64019988 is about 8001.2491524761. The cubic root of 64019988 is about 400.0416373323.

The spelling of 64019988 in words is "sixty-four million, nineteen thousand, nine hundred eighty-eight".