43897728 has 96 divisors (see below), whose sum is σ = 135698760. Its totient is φ = 12536832.

The previous prime is 43897709. The next prime is 43897739. The reversal of 43897728 is 82779834.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17650 + ... + 19982.

Almost surely, 2^43897728 is an apocalyptic number.

43897728 is a gapful number since it is divisible by the number (48) 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 43897728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67849380).

43897728 is an abundant number, since it is smaller than the sum of its proper divisors (91801032).

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

43897728 is a wasteful number, since it uses less digits than its factorization.

43897728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364 (or 2345 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 43897728 is about 6625.5360537846. The cubic root of 43897728 is about 352.7610942232.

The spelling of 43897728 in words is "forty-three million, eight hundred ninety-seven thousand, seven hundred twenty-eight".