28775913 has 8 divisors (see below), whose sum is σ = 38452608. Its totient is φ = 19141584.

The previous prime is 28775909. The next prime is 28775927. The reversal of 28775913 is 31957782.

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

It is not a de Polignac number, because 28775913 - 2² = 28775909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28775933) 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, 8970 + ... + 11747.

It is an arithmetic number, because the mean of its divisors is an integer number (4806576).

Almost surely, 2^28775913 is an apocalyptic number.

It is an amenable number.

28775913 is a deficient number, since it is larger than the sum of its proper divisors (9676695).

28775913 is a wasteful number, since it uses less digits than its factorization.

28775913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21183.

The product of its digits is 105840, while the sum is 42.

The square root of 28775913 is about 5364.3185028482. The cubic root of 28775913 is about 306.4382949781.

The spelling of 28775913 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred thirteen".