28829640 has 96 divisors (see below), whose sum is σ = 100630080. Its totient is φ = 6588288.

The previous prime is 28829639. The next prime is 28829641. The reversal of 28829640 is 4692882.

It is an interprime number because it is at equal distance from previous prime (28829639) and next prime (28829641).

It is a super-2 number, since 2×28829640² = 1662296285059200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28829641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3429 + ... + 8331.

It is an arithmetic number, because the mean of its divisors is an integer number (1048230).

Almost surely, 2^28829640 is an apocalyptic number.

28829640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28829640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50315040).

28829640 is an abundant number, since it is smaller than the sum of its proper divisors (71800440).

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

28829640 is a wasteful number, since it uses less digits than its factorization.

28829640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931 (or 4920 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28829640 is about 5369.3239797948. The cubic root of 28829640 is about 306.6288915874.

The spelling of 28829640 in words is "twenty-eight million, eight hundred twenty-nine thousand, six hundred forty".