64145990 has 16 divisors (see below), whose sum is σ = 116240400. Its totient is φ = 25485600.

The previous prime is 64145933. The next prime is 64145993. The reversal of 64145990 is 9954146.

64145990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64145990² = 8229416066160200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64145993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20036 + ... + 23015.

It is an arithmetic number, because the mean of its divisors is an integer number (7265025).

Almost surely, 2^64145990 is an apocalyptic number.

64145990 is a deficient number, since it is larger than the sum of its proper divisors (52094410).

64145990 is a wasteful number, since it uses less digits than its factorization.

64145990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43207.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 64145990 is about 8009.1191775376. The cubic root of 64145990 is about 400.3039148642.

The spelling of 64145990 in words is "sixty-four million, one hundred forty-five thousand, nine hundred ninety".