28788011 has 4 divisors (see below), whose sum is σ = 32900592. Its totient is φ = 24675432.

The previous prime is 28788007. The next prime is 28788037. The reversal of 28788011 is 11088782.

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

It is a cyclic number.

It is not a de Polignac number, because 28788011 - 2² = 28788007 is a prime.

It is a super-2 number, since 2×28788011² = 1657499154672242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788611) 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, 2056280 + ... + 2056293.

It is an arithmetic number, because the mean of its divisors is an integer number (8225148).

Almost surely, 2^28788011 is an apocalyptic number.

28788011 is a deficient number, since it is larger than the sum of its proper divisors (4112581).

28788011 is an equidigital number, since it uses as much as digits as its factorization.

28788011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112580.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 28788011 is about 5365.4460206026. The cubic root of 28788011 is about 306.4812333328.

The spelling of 28788011 in words is "twenty-eight million, seven hundred eighty-eight thousand, eleven".