28670000 has 100 divisors (see below), whose sum is σ = 72051936. Its totient is φ = 11040000.

The previous prime is 28669967. The next prime is 28670003. The reversal of 28670000 is 7682.

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

It is not an unprimeable number, because it can be changed into a prime (28670003) 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, 469970 + ... + 470030.

Almost surely, 2^28670000 is an apocalyptic number.

28670000 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 28670000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36025968).

28670000 is an abundant number, since it is smaller than the sum of its proper divisors (43381936).

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

28670000 is an equidigital number, since it uses as much as digits as its factorization.

28670000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 28670000 is about 5354.4374120910. The cubic root of 28670000 is about 306.0618725186.

Adding to 28670000 its reverse (7682), we get a palindrome (28677682).

The spelling of 28670000 in words is "twenty-eight million, six hundred seventy thousand".