28423680 has 80 divisors (see below), whose sum is σ = 90891504. Its totient is φ = 7577600.

The previous prime is 28423679. The next prime is 28423721. The reversal of 28423680 is 8632482.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5830 + ... + 9530.

Almost surely, 2^28423680 is an apocalyptic number.

28423680 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 28423680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45445752).

28423680 is an abundant number, since it is smaller than the sum of its proper divisors (62467824).

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

28423680 is an equidigital number, since it uses as much as digits as its factorization.

28423680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727 (or 3711 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28423680 is about 5331.3863112703. The cubic root of 28423680 is about 305.1828340303.

The spelling of 28423680 in words is "twenty-eight million, four hundred twenty-three thousand, six hundred eighty".