64854636 has 144 divisors (see below), whose sum is σ = 197955072. Its totient is φ = 16329600.

The previous prime is 64854607. The next prime is 64854637. The reversal of 64854636 is 63645846.

It is a super-2 number, since 2×64854636² = 8412247621384992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (64854637) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239181 + ... + 239451.

It is an arithmetic number, because the mean of its divisors is an integer number (1374688).

Almost surely, 2^64854636 is an apocalyptic number.

64854636 is a gapful number since it is divisible by the number (66) 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 64854636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98977536).

64854636 is an abundant number, since it is smaller than the sum of its proper divisors (133100436).

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

64854636 is a wasteful number, since it uses less digits than its factorization.

64854636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 331 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 64854636 is about 8053.2376098064. The cubic root of 64854636 is about 401.7726245680.

The spelling of 64854636 in words is "sixty-four million, eight hundred fifty-four thousand, six hundred thirty-six".