28658690 has 32 divisors (see below), whose sum is σ = 54867456. Its totient is φ = 10753600.

The previous prime is 28658689. The next prime is 28658717. The reversal of 28658690 is 9685682.

It is a happy number.

It is a super-2 number, since 2×28658690² = 1642641025032200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11015 + ... + 13365.

It is an arithmetic number, because the mean of its divisors is an integer number (1714608).

Almost surely, 2^28658690 is an apocalyptic number.

28658690 is a deficient number, since it is larger than the sum of its proper divisors (26208766).

28658690 is a wasteful number, since it uses less digits than its factorization.

28658690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 28658690 is about 5353.3811745475. The cubic root of 28658690 is about 306.0216212100.

The spelling of 28658690 in words is "twenty-eight million, six hundred fifty-eight thousand, six hundred ninety".