28019280 has 40 divisors (see below), whose sum is σ = 86860512. Its totient is φ = 7471744.

The previous prime is 28019279. The next prime is 28019293. The reversal of 28019280 is 8291082.

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

It is a super-3 number, since 3×28019280³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58134 + ... + 58613.

Almost surely, 2^28019280 is an apocalyptic number.

28019280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28019280 is an abundant number, since it is smaller than the sum of its proper divisors (58841232).

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

28019280 is a wasteful number, since it uses less digits than its factorization.

28019280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116763 (or 116757 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28019280 is about 5293.3240973891. The cubic root of 28019280 is about 303.7285781435.

The spelling of 28019280 in words is "twenty-eight million, nineteen thousand, two hundred eighty".