28190425 has 6 divisors (see below), whose sum is σ = 34956158. Its totient is φ = 22552320.

The previous prime is 28190423. The next prime is 28190429. The reversal of 28190425 is 52409182.

It can be written as a sum of positive squares in 3 ways, for example, as 1108809 + 27081616 = 1053^2 + 5204^2 .

It is not a de Polignac number, because 28190425 - 2¹ = 28190423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28190423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 563784 + ... + 563833.

Almost surely, 2^28190425 is an apocalyptic number.

28190425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28190425 is a deficient number, since it is larger than the sum of its proper divisors (6765733).

28190425 is a wasteful number, since it uses less digits than its factorization.

28190425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127627 (or 1127622 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28190425 is about 5309.4656039944. The cubic root of 28190425 is about 304.3457263904.

The spelling of 28190425 in words is "twenty-eight million, one hundred ninety thousand, four hundred twenty-five".