28947340 has 24 divisors (see below), whose sum is σ = 63433440. Its totient is φ = 11075328.

The previous prime is 28947319. The next prime is 28947341. The reversal of 28947340 is 4374982.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28947340.

It is not an unprimeable number, because it can be changed into a prime (28947341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31005 + ... + 31924.

It is an arithmetic number, because the mean of its divisors is an integer number (2643060).

Almost surely, 2^28947340 is an apocalyptic number.

28947340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28947340 is an abundant number, since it is smaller than the sum of its proper divisors (34486100).

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

28947340 is a wasteful number, since it uses less digits than its factorization.

28947340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62961 (or 62959 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28947340 is about 5380.2732272627. The cubic root of 28947340 is about 307.0456064406.

The spelling of 28947340 in words is "twenty-eight million, nine hundred forty-seven thousand, three hundred forty".