28774740 has 96 divisors (see below), whose sum is σ = 86929920. Its totient is φ = 7088256.

The previous prime is 28774717. The next prime is 28774751. The reversal of 28774740 is 4747782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48727 + ... + 49313.

It is an arithmetic number, because the mean of its divisors is an integer number (905520).

Almost surely, 2^28774740 is an apocalyptic number.

28774740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28774740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43464960).

28774740 is an abundant number, since it is smaller than the sum of its proper divisors (58155180).

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

28774740 is a wasteful number, since it uses less digits than its factorization.

28774740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 28774740 is about 5364.2091681813. The cubic root of 28774740 is about 306.4341311137.

The spelling of 28774740 in words is "twenty-eight million, seven hundred seventy-four thousand, seven hundred forty".