28870296 has 64 divisors (see below), whose sum is σ = 88838400. Its totient is φ = 7613568.

The previous prime is 28870279. The next prime is 28870297. The reversal of 28870296 is 69207882.

It is a happy number.

It is a super-2 number, since 2×28870296² = 1666987982255232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4426 + ... + 8793.

It is an arithmetic number, because the mean of its divisors is an integer number (1388100).

Almost surely, 2^28870296 is an apocalyptic number.

28870296 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28870296 is an abundant number, since it is smaller than the sum of its proper divisors (59968104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28870296 is a wasteful number, since it uses less digits than its factorization.

28870296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248 (or 13244 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28870296 is about 5373.1085974508. The cubic root of 28870296 is about 306.7729614722.

The spelling of 28870296 in words is "twenty-eight million, eight hundred seventy thousand, two hundred ninety-six".