28507493 has 16 divisors (see below), whose sum is σ = 33886080. Its totient is φ = 23464896.

The previous prime is 28507483. The next prime is 28507499. The reversal of 28507493 is 39470582.

It is not a de Polignac number, because 28507493 - 2⁴ = 28507477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28507499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64130 + ... + 64572.

It is an arithmetic number, because the mean of its divisors is an integer number (2117880).

Almost surely, 2^28507493 is an apocalyptic number.

It is an amenable number.

28507493 is a deficient number, since it is larger than the sum of its proper divisors (5378587).

28507493 is a wasteful number, since it uses less digits than its factorization.

28507493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 28507493 is about 5339.2408636434. The cubic root of 28507493 is about 305.4825042237.

The spelling of 28507493 in words is "twenty-eight million, five hundred seven thousand, four hundred ninety-three".