28413989 has 8 divisors (see below), whose sum is σ = 29029752. Its totient is φ = 27801280.

The previous prime is 28413977. The next prime is 28414003. The reversal of 28413989 is 98931482.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1716100 + 26697889 = 1310^2 + 5167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28413989 - 2¹² = 28409893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28413929) 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, 34199 + ... + 35019.

It is an arithmetic number, because the mean of its divisors is an integer number (3628719).

Almost surely, 2^28413989 is an apocalyptic number.

It is an amenable number.

28413989 is a deficient number, since it is larger than the sum of its proper divisors (615763).

28413989 is an equidigital number, since it uses as much as digits as its factorization.

28413989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527.

The product of its digits is 124416, while the sum is 44.

The square root of 28413989 is about 5330.4773707427. The cubic root of 28413989 is about 305.1481462509.

The spelling of 28413989 in words is "twenty-eight million, four hundred thirteen thousand, nine hundred eighty-nine".