28069425 has 18 divisors (see below), whose sum is σ = 50275862. Its totient is φ = 14970240.

The previous prime is 28069409. The next prime is 28069439. The reversal of 28069425 is 52496082.

28069425 = T₁₄₈₆ + T₁₄₈₇ + ... + T₁₅₁₀.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9199089 + 18870336 = 3033^2 + 4344^2 .

It is not a de Polignac number, because 28069425 - 2⁴ = 28069409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28069425.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62152 + ... + 62601.

Almost surely, 2^28069425 is an apocalyptic number.

28069425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28069425 is a deficient number, since it is larger than the sum of its proper divisors (22206437).

28069425 is a wasteful number, since it uses less digits than its factorization.

28069425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124769 (or 124761 counting only the distinct ones).

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

The square root of 28069425 is about 5298.0586066974. The cubic root of 28069425 is about 303.9096605123.

The spelling of 28069425 in words is "twenty-eight million, sixty-nine thousand, four hundred twenty-five".