28922399 has 4 divisors (see below), whose sum is σ = 31551720. Its totient is φ = 26293080.

The previous prime is 28922371. The next prime is 28922407. The reversal of 28922399 is 99322982.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28922399 - 2⁸ = 28922143 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 (28922329) 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, 1314644 + ... + 1314665.

It is an arithmetic number, because the mean of its divisors is an integer number (7887930).

Almost surely, 2^28922399 is an apocalyptic number.

28922399 is a deficient number, since it is larger than the sum of its proper divisors (2629321).

28922399 is a wasteful number, since it uses less digits than its factorization.

28922399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629320.

The product of its digits is 139968, while the sum is 44.

The square root of 28922399 is about 5377.9549086990. The cubic root of 28922399 is about 306.9573977036.

The spelling of 28922399 in words is "twenty-eight million, nine hundred twenty-two thousand, three hundred ninety-nine".