28781496 has 48 divisors (see below), whose sum is σ = 78726960. Its totient is φ = 9498240.

The previous prime is 28781477. The next prime is 28781497. The reversal of 28781496 is 69418782.

28781496 is a `hidden beast` number, since 2 + 87 + 81 + 496 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5476 + ... + 9356.

It is an arithmetic number, because the mean of its divisors is an integer number (1640145).

Almost surely, 2^28781496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28781496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39363480).

28781496 is an abundant number, since it is smaller than the sum of its proper divisors (49945464).

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

28781496 is a wasteful number, since it uses less digits than its factorization.

28781496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996 (or 3989 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28781496 is about 5364.8388605810. The cubic root of 28781496 is about 306.4581117183.

The spelling of 28781496 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred ninety-six".