28122787 has 8 divisors (see below), whose sum is σ = 35062272. Its totient is φ = 21913800.

The previous prime is 28122727. The next prime is 28122791. The reversal of 28122787 is 78722182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28122787 is a prime.

It is a super-2 number, since 2×28122787² = 1581782297294738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28122727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182539 + ... + 182692.

It is an arithmetic number, because the mean of its divisors is an integer number (4382784).

Almost surely, 2^28122787 is an apocalyptic number.

28122787 is a deficient number, since it is larger than the sum of its proper divisors (6939485).

28122787 is a wasteful number, since it uses less digits than its factorization.

28122787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365249.

The product of its digits is 25088, while the sum is 37.

The square root of 28122787 is about 5303.0922111538. The cubic root of 28122787 is about 304.1021233247.

The spelling of 28122787 in words is "twenty-eight million, one hundred twenty-two thousand, seven hundred eighty-seven".