64856428 has 96 divisors (see below), whose sum is σ = 151732224. Its totient is φ = 23528448.

The previous prime is 64856423. The next prime is 64856437. The reversal of 64856428 is 82465846.

It is not an unprimeable number, because it can be changed into a prime (64856423) 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, 290725 + ... + 290947.

It is an arithmetic number, because the mean of its divisors is an integer number (1580544).

Almost surely, 2^64856428 is an apocalyptic number.

64856428 is a gapful number since it is divisible by the number (68) 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 64856428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75866112).

64856428 is an abundant number, since it is smaller than the sum of its proper divisors (86875796).

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

64856428 is a wasteful number, since it uses less digits than its factorization.

64856428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 309 counting only the distinct ones).

The product of its digits is 368640, while the sum is 43.

The square root of 64856428 is about 8053.3488686384. The cubic root of 64856428 is about 401.7763249969.

The spelling of 64856428 in words is "sixty-four million, eight hundred fifty-six thousand, four hundred twenty-eight".