28420994 has 24 divisors (see below), whose sum is σ = 49834560. Its totient is φ = 11908296.

The previous prime is 28420967. The next prime is 28420999. The reversal of 28420994 is 49902482.

It is not an unprimeable number, because it can be changed into a prime (28420999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30467 + ... + 31385.

It is an arithmetic number, because the mean of its divisors is an integer number (2076440).

Almost surely, 2^28420994 is an apocalyptic number.

28420994 is a deficient number, since it is larger than the sum of its proper divisors (21413566).

28420994 is an equidigital number, since it uses as much as digits as its factorization.

28420994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28420994 is about 5331.1344008569. The cubic root of 28420994 is about 305.1732206034.

The spelling of 28420994 in words is "twenty-eight million, four hundred twenty thousand, nine hundred ninety-four".