28730740 has 12 divisors (see below), whose sum is σ = 60334596. Its totient is φ = 11492288.

The previous prime is 28730729. The next prime is 28730761. The reversal of 28730740 is 4703782.

It can be written as a sum of positive squares in 2 ways, for example, as 2944656 + 25786084 = 1716^2 + 5078^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718249 + ... + 718288.

It is an arithmetic number, because the mean of its divisors is an integer number (5027883).

Almost surely, 2^28730740 is an apocalyptic number.

28730740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28730740 is an abundant number, since it is smaller than the sum of its proper divisors (31603856).

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

28730740 is a wasteful number, since it uses less digits than its factorization.

28730740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436546 (or 1436544 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 28730740 is about 5360.1063422287. The cubic root of 28730740 is about 306.2778600227.

The spelling of 28730740 in words is "twenty-eight million, seven hundred thirty thousand, seven hundred forty".