28691480 has 32 divisors (see below), whose sum is σ = 64830240. Its totient is φ = 11427840.

The previous prime is 28691417. The next prime is 28691483. The reversal of 28691480 is 8419682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691483) 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, 8885 + ... + 11675.

It is an arithmetic number, because the mean of its divisors is an integer number (2025945).

Almost surely, 2^28691480 is an apocalyptic number.

28691480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28691480 is an abundant number, since it is smaller than the sum of its proper divisors (36138760).

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

28691480 is a wasteful number, since it uses less digits than its factorization.

28691480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059 (or 3055 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28691480 is about 5356.4428495038. The cubic root of 28691480 is about 306.1382888408.

The spelling of 28691480 in words is "twenty-eight million, six hundred ninety-one thousand, four hundred eighty".