28421680 has 40 divisors (see below), whose sum is σ = 75521952. Its totient is φ = 9744384.

The previous prime is 28421639. The next prime is 28421681. The reversal of 28421680 is 8612482.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (28421681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24817 + ... + 25936.

Almost surely, 2^28421680 is an apocalyptic number.

28421680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28421680 is an abundant number, since it is smaller than the sum of its proper divisors (47100272).

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

28421680 is a wasteful number, since it uses less digits than its factorization.

28421680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50773 (or 50767 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 28421680 is about 5331.1987394956. The cubic root of 28421680 is about 305.1756759144.

The spelling of 28421680 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred eighty".