64120890 has 32 divisors (see below), whose sum is σ = 154100736. Its totient is φ = 17075520.

The previous prime is 64120873. The next prime is 64120891. The reversal of 64120890 is 9802146.

64120890 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 2×64120890² = 8222977068784200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (64120891) 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 15 ways as a sum of consecutive naturals, for example, 42855 + ... + 44325.

It is an arithmetic number, because the mean of its divisors is an integer number (4815648).

Almost surely, 2^64120890 is an apocalyptic number.

64120890 is an abundant number, since it is smaller than the sum of its proper divisors (89979846).

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

64120890 is a wasteful number, since it uses less digits than its factorization.

64120890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 64120890 is about 8007.5520603990. The cubic root of 64120890 is about 400.2516957566.

The spelling of 64120890 in words is "sixty-four million, one hundred twenty thousand, eight hundred ninety".