64279140 has 96 divisors (see below), whose sum is σ = 185794560. Its totient is φ = 16598400.

The previous prime is 64279139. The next prime is 64279199. The reversal of 64279140 is 4197246.

It is a happy number.

64279140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 336445 + ... + 336635.

It is an arithmetic number, because the mean of its divisors is an integer number (1935360).

Almost surely, 2^64279140 is an apocalyptic number.

64279140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64279140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92897280).

64279140 is an abundant number, since it is smaller than the sum of its proper divisors (121515420).

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

64279140 is a wasteful number, since it uses less digits than its factorization.

64279140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 64279140 is about 8017.4272681453. The cubic root of 64279140 is about 400.5806982326.

The spelling of 64279140 in words is "sixty-four million, two hundred seventy-nine thousand, one hundred forty".