28690425 has 36 divisors (see below), whose sum is σ = 53171820. Its totient is φ = 14770560.

The previous prime is 28690423. The next prime is 28690439. The reversal of 28690425 is 52409682.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 558009 + 28132416 = 747^2 + 5304^2 .

It is not a de Polignac number, because 28690425 - 2¹ = 28690423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28690425.

It is not an unprimeable number, because it can be changed into a prime (28690421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4327 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (1476995).

Almost surely, 2^28690425 is an apocalyptic number.

28690425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28690425 is a deficient number, since it is larger than the sum of its proper divisors (24481395).

28690425 is a wasteful number, since it uses less digits than its factorization.

28690425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 28690425 is about 5356.3443690637. The cubic root of 28690425 is about 306.1345365091.

The spelling of 28690425 in words is "twenty-eight million, six hundred ninety thousand, four hundred twenty-five".