28313497 has 4 divisors (see below), whose sum is σ = 28341940. Its totient is φ = 28285056.

The previous prime is 28313443. The next prime is 28313503. The reversal of 28313497 is 79431382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14295961 + 14017536 = 3781^2 + 3744^2 .

It is a cyclic number.

It is not a de Polignac number, because 28313497 - 2¹¹ = 28311449 is a prime.

It is a super-2 number, since 2×28313497² = 1603308224738018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28313797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12672 + ... + 14737.

It is an arithmetic number, because the mean of its divisors is an integer number (7085485).

Almost surely, 2^28313497 is an apocalyptic number.

It is an amenable number.

28313497 is a deficient number, since it is larger than the sum of its proper divisors (28443).

28313497 is a wasteful number, since it uses less digits than its factorization.

28313497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28442.

The product of its digits is 36288, while the sum is 37.

The square root of 28313497 is about 5321.0428489160. The cubic root of 28313497 is about 304.7879812900.

It can be divided in two parts, 2831 and 3497, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 28313497 in words is "twenty-eight million, three hundred thirteen thousand, four hundred ninety-seven".