28690000 has 100 divisors (see below), whose sum is σ = 73601440. Its totient is φ = 10800000.

The previous prime is 28689979. The next prime is 28690001. The reversal of 28690000 is 9682.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×28690000² = 1646232200000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28690001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 189925 + ... + 190075.

Almost surely, 2^28690000 is an apocalyptic number.

28690000 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 28690000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36800720).

28690000 is an abundant number, since it is smaller than the sum of its proper divisors (44911440).

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

28690000 is a wasteful number, since it uses less digits than its factorization.

28690000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28690000 is about 5356.3046963368. The cubic root of 28690000 is about 306.1330248803.

Adding to 28690000 its reverse (9682), we get a palindrome (28699682).

The spelling of 28690000 in words is "twenty-eight million, six hundred ninety thousand".