64019990 has 32 divisors (see below), whose sum is σ = 120066624. Its totient is φ = 24554880.

The previous prime is 64019957. The next prime is 64020013. The reversal of 64019990 is 9991046.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25052 + ... + 27488.

It is an arithmetic number, because the mean of its divisors is an integer number (3752082).

Almost surely, 2^64019990 is an apocalyptic number.

64019990 is a deficient number, since it is larger than the sum of its proper divisors (56046634).

64019990 is a wasteful number, since it uses less digits than its factorization.

64019990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 64019990 is about 8001.2492774566. The cubic root of 64019990 is about 400.0416414981.

The spelling of 64019990 in words is "sixty-four million, nineteen thousand, nine hundred ninety".