64549440 has 224 divisors, whose sum is σ = 236037120. Its totient is φ = 16588800.

The previous prime is 64549417. The next prime is 64549453. The reversal of 64549440 is 4494546.

64549440 is a `hidden beast` number, since 645 + 4 + 9 + 4 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64549395 and 64549404.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267720 + ... + 267960.

Almost surely, 2^64549440 is an apocalyptic number.

64549440 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 64549440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118018560).

64549440 is an abundant number, since it is smaller than the sum of its proper divisors (171487680).

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

64549440 is a wasteful number, since it uses less digits than its factorization.

64549440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 64549440 is about 8034.2666124544. The cubic root of 64549440 is about 401.1414065464.

The spelling of 64549440 in words is "sixty-four million, five hundred forty-nine thousand, four hundred forty".