28491275 has 12 divisors (see below), whose sum is σ = 35414400. Its totient is φ = 22738080.

The previous prime is 28491233. The next prime is 28491283. The reversal of 28491275 is 57219482.

It is not a de Polignac number, because 28491275 - 2⁸ = 28491019 is a prime.

It is a super-2 number, since 2×28491275² = 1623505502251250, which contains 22 as substring.

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, 11606 + ... + 13844.

It is an arithmetic number, because the mean of its divisors is an integer number (2951200).

Almost surely, 2^28491275 is an apocalyptic number.

28491275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28491275 is a deficient number, since it is larger than the sum of its proper divisors (6923125).

28491275 is a wasteful number, since it uses less digits than its factorization.

28491275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2753 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 28491275 is about 5337.7218923432. The cubic root of 28491275 is about 305.4245632575.

The spelling of 28491275 in words is "twenty-eight million, four hundred ninety-one thousand, two hundred seventy-five".