28773897 has 12 divisors (see below), whose sum is σ = 40107984. Its totient is φ = 18347560.

The previous prime is 28773893. The next prime is 28773919. The reversal of 28773897 is 79837782.

It is not a de Polignac number, because 28773897 - 2² = 28773893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28773893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7479 + ... + 10652.

It is an arithmetic number, because the mean of its divisors is an integer number (3342332).

Almost surely, 2^28773897 is an apocalyptic number.

It is an amenable number.

28773897 is a deficient number, since it is larger than the sum of its proper divisors (11334087).

28773897 is a wasteful number, since it uses less digits than its factorization.

28773897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18180 (or 18157 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 51.

The square root of 28773897 is about 5364.1305912515. The cubic root of 28773897 is about 306.4311385990.

The spelling of 28773897 in words is "twenty-eight million, seven hundred seventy-three thousand, eight hundred ninety-seven".