28151340 has 96 divisors (see below), whose sum is σ = 91144704. Its totient is φ = 6359040.

The previous prime is 28151327. The next prime is 28151341. The reversal of 28151340 is 4315182.

It is a self number, because there is not a number n which added to its sum of digits gives 28151340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28151341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40395 + ... + 41085.

It is an arithmetic number, because the mean of its divisors is an integer number (949424).

Almost surely, 2^28151340 is an apocalyptic number.

28151340 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 28151340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45572352).

28151340 is an abundant number, since it is smaller than the sum of its proper divisors (62993364).

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

28151340 is a wasteful number, since it uses less digits than its factorization.

28151340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28151340 is about 5305.7836367496. The cubic root of 28151340 is about 304.2050065722.

The spelling of 28151340 in words is "twenty-eight million, one hundred fifty-one thousand, three hundred forty".