28622999 has 4 divisors (see below), whose sum is σ = 28832064. Its totient is φ = 28413936.

The previous prime is 28622983. The next prime is 28623037. The reversal of 28622999 is 99922682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99922682 = 2 ⋅49961341.

It is a cyclic number.

It is not a de Polignac number, because 28622999 - 2⁴ = 28622983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28622929) 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, 104327 + ... + 104600.

It is an arithmetic number, because the mean of its divisors is an integer number (7208016).

Almost surely, 2^28622999 is an apocalyptic number.

28622999 is a deficient number, since it is larger than the sum of its proper divisors (209065).

28622999 is a wasteful number, since it uses less digits than its factorization.

28622999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209064.

The product of its digits is 279936, while the sum is 47.

The square root of 28622999 is about 5350.0466353108. The cubic root of 28622999 is about 305.8945305563.

The spelling of 28622999 in words is "twenty-eight million, six hundred twenty-two thousand, nine hundred ninety-nine".