28693172 has 6 divisors (see below), whose sum is σ = 50213058. Its totient is φ = 14346584.

The previous prime is 28693139. The next prime is 28693199. The reversal of 28693172 is 27139682.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 12645136 = 4006^2 + 3556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3586643 + ... + 3586650.

It is an arithmetic number, because the mean of its divisors is an integer number (8368843).

Almost surely, 2^28693172 is an apocalyptic number.

It is an amenable number.

28693172 is a deficient number, since it is larger than the sum of its proper divisors (21519886).

28693172 is a wasteful number, since it uses less digits than its factorization.

28693172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7173297 (or 7173295 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 28693172 is about 5356.6007878131. The cubic root of 28693172 is about 306.1443066064.

The spelling of 28693172 in words is "twenty-eight million, six hundred ninety-three thousand, one hundred seventy-two".