28261740 has 96 divisors (see below), whose sum is σ = 89752320. Its totient is φ = 6587136.

The previous prime is 28261729. The next prime is 28261741. The reversal of 28261740 is 4716282.

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

It is a junction number, because it is equal to n+sod(n) for n = 28261698 and 28261707.

It is not an unprimeable number, because it can be changed into a prime (28261741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13867 + ... + 15773.

It is an arithmetic number, because the mean of its divisors is an integer number (934920).

Almost surely, 2^28261740 is an apocalyptic number.

28261740 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 28261740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44876160).

28261740 is an abundant number, since it is smaller than the sum of its proper divisors (61490580).

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

28261740 is a wasteful number, since it uses less digits than its factorization.

28261740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28261740 is about 5316.1771979497. The cubic root of 28261740 is about 304.6021507950.

The spelling of 28261740 in words is "twenty-eight million, two hundred sixty-one thousand, seven hundred forty".