64534890 has 64 divisors (see below), whose sum is σ = 187432704. Its totient is φ = 13882368.

The previous prime is 64534853. The next prime is 64534891. The reversal of 64534890 is 9843546.

It is not an unprimeable number, because it can be changed into a prime (64534891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5469 + ... + 12608.

It is an arithmetic number, because the mean of its divisors is an integer number (2928636).

Almost surely, 2^64534890 is an apocalyptic number.

64534890 is an abundant number, since it is smaller than the sum of its proper divisors (122897814).

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

64534890 is a wasteful number, since it uses less digits than its factorization.

64534890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18111.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 64534890 is about 8033.3610649590. The cubic root of 64534890 is about 401.1112640383. Note that the first 3 decimals are identical.

The spelling of 64534890 in words is "sixty-four million, five hundred thirty-four thousand, eight hundred ninety".