28419725 has 36 divisors (see below), whose sum is σ = 38551104. Its totient is φ = 20766240.

The previous prime is 28419707. The next prime is 28419731. The reversal of 28419725 is 52791482.

28419725 = 618² + 619² + ... + 684².

It is not a de Polignac number, because 28419725 - 2⁶ = 28419661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 424142 + ... + 424208.

It is an arithmetic number, because the mean of its divisors is an integer number (1070864).

Almost surely, 2^28419725 is an apocalyptic number.

28419725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28419725 is a deficient number, since it is larger than the sum of its proper divisors (10131379).

28419725 is a wasteful number, since it uses less digits than its factorization.

28419725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 138 counting only the distinct ones).

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

The square root of 28419725 is about 5331.0153817073. The cubic root of 28419725 is about 305.1686785316.

The spelling of 28419725 in words is "twenty-eight million, four hundred nineteen thousand, seven hundred twenty-five".