28400339 has 16 divisors (see below), whose sum is σ = 32081280. Its totient is φ = 24917760.

The previous prime is 28400329. The next prime is 28400357. The reversal of 28400339 is 93300482.

28400339 = T₈₂ + T₈₃ + ... + T₅₅₄.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28400339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28400329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45572 + ... + 46190.

It is an arithmetic number, because the mean of its divisors is an integer number (2005080).

Almost surely, 2^28400339 is an apocalyptic number.

28400339 is a deficient number, since it is larger than the sum of its proper divisors (3680941).

28400339 is a wasteful number, since it uses less digits than its factorization.

28400339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 28400339 is about 5329.1968438030. The cubic root of 28400339 is about 305.0992743217.

The spelling of 28400339 in words is "twenty-eight million, four hundred thousand, three hundred thirty-nine".