28553697 has 24 divisors (see below), whose sum is σ = 43400448. Its totient is φ = 18064800.

The previous prime is 28553689. The next prime is 28553737. The reversal of 28553697 is 79635582.

It is a happy number.

28553697 is a `hidden beast` number, since 2 + 8 + 553 + 6 + 97 = 666.

It is not a de Polignac number, because 28553697 - 2³ = 28553689 is a prime.

It is a super-2 number, since 2×28553697² = 1630627224735618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28553617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13822 + ... + 15752.

It is an arithmetic number, because the mean of its divisors is an integer number (1808352).

Almost surely, 2^28553697 is an apocalyptic number.

It is an amenable number.

28553697 is a deficient number, since it is larger than the sum of its proper divisors (14846751).

28553697 is a wasteful number, since it uses less digits than its factorization.

28553697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2018 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 28553697 is about 5343.5659441987. The cubic root of 28553697 is about 305.6474537808.

The spelling of 28553697 in words is "twenty-eight million, five hundred fifty-three thousand, six hundred ninety-seven".