258438728 has 16 divisors (see below), whose sum is σ = 484788780. Its totient is φ = 129161728.

The previous prime is 258438727. The next prime is 258438731. The reversal of 258438728 is 827834852.

It can be written as a sum of positive squares in 2 ways, for example, as 255936004 + 2502724 = 15998^2 + 1582^2 .

It is a super-2 number, since 2×258438728² = 133581152260515968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (258438721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16400 + ... + 28032.

Almost surely, 2^258438728 is an apocalyptic number.

It is an amenable number.

258438728 is a deficient number, since it is larger than the sum of its proper divisors (226350052).

258438728 is a wasteful number, since it uses less digits than its factorization.

258438728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14416 (or 14412 counting only the distinct ones).

The product of its digits is 860160, while the sum is 47.

The square root of 258438728 is about 16076.0296093283. The cubic root of 258438728 is about 636.9703224551.

The spelling of 258438728 in words is "two hundred fifty-eight million, four hundred thirty-eight thousand, seven hundred twenty-eight".