28913490 has 64 divisors (see below), whose sum is σ = 77673600. Its totient is φ = 7653312.

The previous prime is 28913473. The next prime is 28913491. The reversal of 28913490 is 9431982.

It is not an unprimeable number, because it can be changed into a prime (28913491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46401 + ... + 47019.

It is an arithmetic number, because the mean of its divisors is an integer number (1213650).

Almost surely, 2^28913490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28913490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38836800).

28913490 is an abundant number, since it is smaller than the sum of its proper divisors (48760110).

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

28913490 is a wasteful number, since it uses less digits than its factorization.

28913490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28913490 is about 5377.1265560706. The cubic root of 28913490 is about 306.9258769862.

It can be divided in two parts, 28913 and 490, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28913490 in words is "twenty-eight million, nine hundred thirteen thousand, four hundred ninety".