28405299 has 16 divisors (see below), whose sum is σ = 42561792. Its totient is φ = 16719648.

The previous prime is 28405277. The next prime is 28405303. The reversal of 28405299 is 99250482.

It is not a de Polignac number, because 28405299 - 2⁹ = 28404787 is a prime.

It is a super-2 number, since 2×28405299² = 1613722022558802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28405219) 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, 14937 + ... + 16730.

It is an arithmetic number, because the mean of its divisors is an integer number (2660112).

Almost surely, 2^28405299 is an apocalyptic number.

28405299 is a deficient number, since it is larger than the sum of its proper divisors (14156493).

28405299 is a wasteful number, since it uses less digits than its factorization.

28405299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31706.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 28405299 is about 5329.6621844166. The cubic root of 28405299 is about 305.1170347237.

The spelling of 28405299 in words is "twenty-eight million, four hundred five thousand, two hundred ninety-nine".