28992213 has 24 divisors (see below), whose sum is σ = 43962048. Its totient is φ = 18376512.

The previous prime is 28992209. The next prime is 28992217. The reversal of 28992213 is 31229982.

It is an interprime number because it is at equal distance from previous prime (28992209) and next prime (28992217).

It is not a de Polignac number, because 28992213 - 2² = 28992209 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28992217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46681 + ... + 47297.

It is an arithmetic number, because the mean of its divisors is an integer number (1831752).

Almost surely, 2^28992213 is an apocalyptic number.

28992213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28992213 is a deficient number, since it is larger than the sum of its proper divisors (14969835).

28992213 is a wasteful number, since it uses less digits than its factorization.

28992213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 870 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28992213 is about 5384.4417537940. The cubic root of 28992213 is about 307.2041811056.

The spelling of 28992213 in words is "twenty-eight million, nine hundred ninety-two thousand, two hundred thirteen".