28071400 has 48 divisors (see below), whose sum is σ = 74593440. Its totient is φ = 9624000.

The previous prime is 28071383. The next prime is 28071409. The reversal of 28071400 is 417082.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28071409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8626 + ... + 11425.

It is an arithmetic number, because the mean of its divisors is an integer number (1554030).

Almost surely, 2^28071400 is an apocalyptic number.

28071400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28071400 is an abundant number, since it is smaller than the sum of its proper divisors (46522040).

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

28071400 is a wasteful number, since it uses less digits than its factorization.

28071400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20074 (or 20065 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 28071400 is about 5298.2449924480. The cubic root of 28071400 is about 303.9167881669.

Adding to 28071400 its reverse (417082), we get a palindrome (28488482).

The spelling of 28071400 in words is "twenty-eight million, seventy-one thousand, four hundred".