28661490 has 192 divisors, whose sum is σ = 93405312. Its totient is φ = 5990400.

The previous prime is 28661489. The next prime is 28661527. The reversal of 28661490 is 9416682.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 218725 + ... + 218855.

It is an arithmetic number, because the mean of its divisors is an integer number (486486).

It is a vampire number, since it can be written as 4290 ⋅ 6681 (with its own digits).

Almost surely, 2^28661490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28661490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46702656).

28661490 is an abundant number, since it is smaller than the sum of its proper divisors (64743822).

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

28661490 is a wasteful number, since it uses less digits than its factorization.

28661490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28661490 is about 5353.6426851257. The cubic root of 28661490 is about 306.0315871532.

It can be divided in two parts, 2866 and 1490, that added together give a square (4356 = 66²).

The spelling of 28661490 in words is "twenty-eight million, six hundred sixty-one thousand, four hundred ninety".