234721728 has 42 divisors (see below), whose sum is σ = 672789104. Its totient is φ = 78240384.

The previous prime is 234721691. The next prime is 234721733. The reversal of 234721728 is 827127432.

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 = 234721692 and 234721701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203176 + ... + 204327.

Almost surely, 2^234721728 is an apocalyptic number.

It is an amenable number.

234721728 is an abundant number, since it is smaller than the sum of its proper divisors (438067376).

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

234721728 is a wasteful number, since it uses less digits than its factorization.

234721728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407521 (or 407508 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 234721728 is about 15320.6307964131. The cubic root of 234721728 is about 616.8569060327.

It can be divided in two parts, 23472 and 1728, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 234721728 in words is "two hundred thirty-four million, seven hundred twenty-one thousand, seven hundred twenty-eight".