64854840 has 64 divisors (see below), whose sum is σ = 196421760. Its totient is φ = 17129600.

The previous prime is 64854799. The next prime is 64854893. The reversal of 64854840 is 4845846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10315 + ... + 15365.

It is an arithmetic number, because the mean of its divisors is an integer number (3069090).

Almost surely, 2^64854840 is an apocalyptic number.

64854840 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 64854840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98210880).

64854840 is an abundant number, since it is smaller than the sum of its proper divisors (131566920).

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

64854840 is a wasteful number, since it uses less digits than its factorization.

64854840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172 (or 5168 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 64854840 is about 8053.2502755099. The cubic root of 64854840 is about 401.7730458256.

It can be divided in two parts, 6485 and 4840, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 64854840 in words is "sixty-four million, eight hundred fifty-four thousand, eight hundred forty".