28493780 has 48 divisors (see below), whose sum is σ = 71366400. Its totient is φ = 9343488.

The previous prime is 28493767. The next prime is 28493809. The reversal of 28493780 is 8739482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1205 + ... + 7644.

It is an arithmetic number, because the mean of its divisors is an integer number (1486800).

Almost surely, 2^28493780 is an apocalyptic number.

28493780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28493780 is an abundant number, since it is smaller than the sum of its proper divisors (42872620).

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

28493780 is a wasteful number, since it uses less digits than its factorization.

28493780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8888 (or 8886 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28493780 is about 5337.9565378523. The cubic root of 28493780 is about 305.4335141394.

The spelling of 28493780 in words is "twenty-eight million, four hundred ninety-three thousand, seven hundred eighty".