28491480 has 256 divisors, whose sum is σ = 105062400. Its totient is φ = 6842880.

The previous prime is 28491409. The next prime is 28491521. The reversal of 28491480 is 8419482.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 770022 + ... + 770058.

It is an arithmetic number, because the mean of its divisors is an integer number (410400).

Almost surely, 2^28491480 is an apocalyptic number.

28491480 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 28491480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52531200).

28491480 is an abundant number, since it is smaller than the sum of its proper divisors (76570920).

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

28491480 is a wasteful number, since it uses less digits than its factorization.

28491480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28491480 is about 5337.7410952574. The cubic root of 28491480 is about 305.4252957845.

The spelling of 28491480 in words is "twenty-eight million, four hundred ninety-one thousand, four hundred eighty".