28212730 has 96 divisors (see below), whose sum is σ = 65729664. Its totient is φ = 8636544.

The previous prime is 28212721. The next prime is 28212731. The reversal of 28212730 is 3721282.

It is a junction number, because it is equal to n+sod(n) for n = 28212695 and 28212704.

It is not an unprimeable number, because it can be changed into a prime (28212731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273859 + ... + 273961.

It is an arithmetic number, because the mean of its divisors is an integer number (684684).

Almost surely, 2^28212730 is an apocalyptic number.

28212730 is an abundant number, since it is smaller than the sum of its proper divisors (37516934).

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

28212730 is a wasteful number, since it uses less digits than its factorization.

28212730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 28212730 is about 5311.5656825460. The cubic root of 28212730 is about 304.4259739901.

It can be divided in two parts, 282 and 12730, that multiplied together give a triangular number (3589860 = T₂₆₇₉).

The spelling of 28212730 in words is "twenty-eight million, two hundred twelve thousand, seven hundred thirty".