28979890 has 8 divisors (see below), whose sum is σ = 52163820. Its totient is φ = 11591952.

The previous prime is 28979861. The next prime is 28979897. The reversal of 28979890 is 9897982.

It can be written as a sum of positive squares in 2 ways, for example, as 27489049 + 1490841 = 5243^2 + 1221^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28979897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448985 + ... + 1449004.

Almost surely, 2^28979890 is an apocalyptic number.

28979890 is a deficient number, since it is larger than the sum of its proper divisors (23183930).

28979890 is a wasteful number, since it uses less digits than its factorization.

28979890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897996.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 28979890 is about 5383.2973167010. The cubic root of 28979890 is about 307.1606497200.

The spelling of 28979890 in words is "twenty-eight million, nine hundred seventy-nine thousand, eight hundred ninety".