64673280 has 240 divisors, whose sum is σ = 256617504. Its totient is φ = 14745600.

The previous prime is 64673243. The next prime is 64673341. The reversal of 64673280 is 8237646.

64673280 is a `hidden beast` number, since 646 + 7 + 3 + 2 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161080 + ... + 161480.

Almost surely, 2^64673280 is an apocalyptic number.

64673280 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 64673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128308752).

64673280 is an abundant number, since it is smaller than the sum of its proper divisors (191944224).

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

64673280 is a wasteful number, since it uses less digits than its factorization.

64673280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 64673280 is about 8041.9699079268. The cubic root of 64673280 is about 401.3977765291.

The spelling of 64673280 in words is "sixty-four million, six hundred seventy-three thousand, two hundred eighty".