28781436 has 24 divisors (see below), whose sum is σ = 67611600. Its totient is φ = 9528832.

The previous prime is 28781429. The next prime is 28781453. The reversal of 28781436 is 63418782.

It is a junction number, because it is equal to n+sod(n) for n = 28781394 and 28781403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6261 + ... + 9836.

It is an arithmetic number, because the mean of its divisors is an integer number (2817150).

Almost surely, 2^28781436 is an apocalyptic number.

It is an amenable number.

28781436 is an abundant number, since it is smaller than the sum of its proper divisors (38830164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28781436 is a wasteful number, since it uses less digits than its factorization.

28781436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16253 (or 16251 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28781436 is about 5364.8332686114. The cubic root of 28781436 is about 306.4578987632.

The spelling of 28781436 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred thirty-six".