28990716 has 12 divisors (see below), whose sum is σ = 67645032. Its totient is φ = 9663568.

The previous prime is 28990711. The next prime is 28990727. The reversal of 28990716 is 61709982.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28990716² = 1680923228385312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990711) 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, 1207935 + ... + 1207958.

It is an arithmetic number, because the mean of its divisors is an integer number (5637086).

Almost surely, 2^28990716 is an apocalyptic number.

It is an amenable number.

28990716 is an abundant number, since it is smaller than the sum of its proper divisors (38654316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28990716 is a wasteful number, since it uses less digits than its factorization.

28990716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415900 (or 2415898 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 28990716 is about 5384.3027403741. The cubic root of 28990716 is about 307.1988935643.

The spelling of 28990716 in words is "twenty-eight million, nine hundred ninety thousand, seven hundred sixteen".