28691442 has 64 divisors (see below), whose sum is σ = 71688960. Its totient is φ = 8439552.

The previous prime is 28691417. The next prime is 28691483. The reversal of 28691442 is 24419682.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28691397 and 28691406.

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, 15258 + ... + 17034.

It is an arithmetic number, because the mean of its divisors is an integer number (1120140).

Almost surely, 2^28691442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28691442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35844480).

28691442 is an abundant number, since it is smaller than the sum of its proper divisors (42997518).

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

28691442 is a wasteful number, since it uses less digits than its factorization.

28691442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824 (or 1818 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28691442 is about 5356.4393023724. The cubic root of 28691442 is about 306.1381536874.

The spelling of 28691442 in words is "twenty-eight million, six hundred ninety-one thousand, four hundred forty-two".