64990 has 16 divisors (see below), whose sum is σ = 119952. Its totient is φ = 25344.

The previous prime is 64969. The next prime is 64997. The reversal of 64990 is 9946.

64990 = 112² + 113² + ... + 116².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64997) 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, 622 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (7497).

2⁶⁴⁹⁹⁰ is an apocalyptic number.

64990 is a deficient number, since it is larger than the sum of its proper divisors (54962).

64990 is a wasteful number, since it uses less digits than its factorization.

64990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 64990 is about 254.9313633118. The cubic root of 64990 is about 40.2051955695.

The spelling of 64990 in words is "sixty-four thousand, nine hundred ninety".