28909416 has 64 divisors (see below), whose sum is σ = 74923200. Its totient is φ = 9289728.

The previous prime is 28909409. The next prime is 28909451. The reversal of 28909416 is 61490982.

It is a super-2 number, since 2×28909416² = 1671508666922112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112360 + ... + 112616.

It is an arithmetic number, because the mean of its divisors is an integer number (1170675).

Almost surely, 2^28909416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28909416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37461600).

28909416 is an abundant number, since it is smaller than the sum of its proper divisors (46013784).

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

28909416 is a wasteful number, since it uses less digits than its factorization.

28909416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28909416 is about 5376.7477158595. The cubic root of 28909416 is about 306.9114607079.

The spelling of 28909416 in words is "twenty-eight million, nine hundred nine thousand, four hundred sixteen".