64234728 has 128 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 20217600.

The previous prime is 64234717. The next prime is 64234747. The reversal of 64234728 is 82743246.

64234728 is a `hidden beast` number, since 642 + 3 + 4 + 7 + 2 + 8 = 666.

It is a super-2 number, since 2×64234728² = 8252200562467968, which contains 22 as substring.

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 = 64234692 and 64234701.

It is a congruent number.

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, 354798 + ... + 354978.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^64234728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64234728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

64234728 is an abundant number, since it is smaller than the sum of its proper divisors (124462872).

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

64234728 is a wasteful number, since it uses less digits than its factorization.

64234728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 270 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 64234728 is about 8014.6570731379. The cubic root of 64234728 is about 400.4884200386.

The spelling of 64234728 in words is "sixty-four million, two hundred thirty-four thousand, seven hundred twenty-eight".