28540736 has 84 divisors (see below), whose sum is σ = 69494400. Its totient is φ = 11563776.

The previous prime is 28540697. The next prime is 28540751. The reversal of 28540736 is 63704582.

It is a happy number.

It is a super-2 number, since 2×28540736² = 1629147222843392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28540696 and 28540705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59345 + ... + 59823.

Almost surely, 2^28540736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28540736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34747200).

28540736 is an abundant number, since it is smaller than the sum of its proper divisors (40953664).

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

28540736 is a wasteful number, since it uses less digits than its factorization.

28540736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 28540736 is about 5342.3530396259. The cubic root of 28540736 is about 305.6012006203.

The spelling of 28540736 in words is "twenty-eight million, five hundred forty thousand, seven hundred thirty-six".