28784394 has 48 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 9324000.

The previous prime is 28784381. The next prime is 28784407. The reversal of 28784394 is 49348782.

It is an interprime number because it is at equal distance from previous prime (28784381) and next prime (28784407).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128967 + ... + 129189.

It is an arithmetic number, because the mean of its divisors is an integer number (1336608).

Almost surely, 2^28784394 is an apocalyptic number.

28784394 is an abundant number, since it is smaller than the sum of its proper divisors (35372790).

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

28784394 is a wasteful number, since it uses less digits than its factorization.

28784394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 400 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28784394 is about 5365.1089457717. The cubic root of 28784394 is about 306.4683970975.

It can be divided in two parts, 287 and 84394, that added together give a square (84681 = 291²).

The spelling of 28784394 in words is "twenty-eight million, seven hundred eighty-four thousand, three hundred ninety-four".