28994890 has 8 divisors (see below), whose sum is σ = 52190820. Its totient is φ = 11597952.

The previous prime is 28994879. The next prime is 28994891. The reversal of 28994890 is 9849982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23882769 + 5112121 = 4887^2 + 2261^2 .

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

It is a super-2 number, since 2×28994890² = 1681407292224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28994891) 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, 1449735 + ... + 1449754.

Almost surely, 2^28994890 is an apocalyptic number.

28994890 is a deficient number, since it is larger than the sum of its proper divisors (23195930).

28994890 is a wasteful number, since it uses less digits than its factorization.

28994890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899496.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 28994890 is about 5384.6903346432. The cubic root of 28994890 is about 307.2136360615.

The spelling of 28994890 in words is "twenty-eight million, nine hundred ninety-four thousand, eight hundred ninety".