64198890 has 96 divisors (see below), whose sum is σ = 192157056. Its totient is φ = 14567040.

The previous prime is 64198889. The next prime is 64198913. The reversal of 64198890 is 9889146.

64198890 = 15² + 16² + ... + 577².

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113749 + ... + 114311.

It is an arithmetic number, because the mean of its divisors is an integer number (2001636).

Almost surely, 2^64198890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64198890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96078528).

64198890 is an abundant number, since it is smaller than the sum of its proper divisors (127958166).

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

64198890 is a wasteful number, since it uses less digits than its factorization.

64198890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 64198890 is about 8012.4209824497. The cubic root of 64198890 is about 400.4139256827.

The spelling of 64198890 in words is "sixty-four million, one hundred ninety-eight thousand, eight hundred ninety".