28097404 has 36 divisors (see below), whose sum is σ = 52473960. Its totient is φ = 13147680.

The previous prime is 28097387. The next prime is 28097411. The reversal of 28097404 is 40479082.

It is a happy number.

It is a super-2 number, since 2×28097404² = 1578928223078432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28097404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214419 + ... + 214549.

It is an arithmetic number, because the mean of its divisors is an integer number (1457610).

Almost surely, 2^28097404 is an apocalyptic number.

It is an amenable number.

28097404 is a deficient number, since it is larger than the sum of its proper divisors (24376556).

28097404 is a wasteful number, since it uses less digits than its factorization.

28097404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28097404 is about 5300.6984445448. The cubic root of 28097404 is about 304.0106038545.

The spelling of 28097404 in words is "twenty-eight million, ninety-seven thousand, four hundred four".