28801690 has 8 divisors (see below), whose sum is σ = 51843060. Its totient is φ = 11520672.

The previous prime is 28801679. The next prime is 28801691. The reversal of 28801690 is 9610882.

It can be written as a sum of positive squares in 2 ways, for example, as 26822041 + 1979649 = 5179^2 + 1407^2 .

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

It is a super-2 number, since 2×28801690² = 1659074693712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28801691) 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, 1440075 + ... + 1440094.

Almost surely, 2^28801690 is an apocalyptic number.

28801690 is a deficient number, since it is larger than the sum of its proper divisors (23041370).

28801690 is a wasteful number, since it uses less digits than its factorization.

28801690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880176.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 28801690 is about 5366.7206001431. The cubic root of 28801690 is about 306.5297685019.

The spelling of 28801690 in words is "twenty-eight million, eight hundred one thousand, six hundred ninety".