64021386 has 128 divisors (see below), whose sum is σ = 162570240. Its totient is φ = 16531200.

The previous prime is 64021369. The next prime is 64021387. The reversal of 64021386 is 68312046.

64021386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64021387) 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 63 ways as a sum of consecutive naturals, for example, 771301 + ... + 771383.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^64021386 is an apocalyptic number.

64021386 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64021386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81285120).

64021386 is an abundant number, since it is smaller than the sum of its proper divisors (98548854).

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

64021386 is a wasteful number, since it uses less digits than its factorization.

64021386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 64021386 is about 8001.3365133583. The cubic root of 64021386 is about 400.0445492049.

The spelling of 64021386 in words is "sixty-four million, twenty-one thousand, three hundred eighty-six".