28258690 has 8 divisors (see below), whose sum is σ = 50865660. Its totient is φ = 11303472.

The previous prime is 28258669. The next prime is 28258691. The reversal of 28258690 is 9685282.

It can be written as a sum of positive squares in 2 ways, for example, as 26245129 + 2013561 = 5123^2 + 1419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28258690² = 1597107121032200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28258691) 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, 1412925 + ... + 1412944.

Almost surely, 2^28258690 is an apocalyptic number.

28258690 is a deficient number, since it is larger than the sum of its proper divisors (22606970).

28258690 is a wasteful number, since it uses less digits than its factorization.

28258690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825876.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 28258690 is about 5315.8903299447. The cubic root of 28258690 is about 304.5911928712.

The spelling of 28258690 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred ninety".