28031436 has 72 divisors (see below), whose sum is σ = 75754224. Its totient is φ = 8709120.

The previous prime is 28031417. The next prime is 28031447. The reversal of 28031436 is 63413082.

It is a happy number.

It is a super-2 number, since 2×28031436² = 1571522808444192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99616 + ... + 99896.

It is an arithmetic number, because the mean of its divisors is an integer number (1052142).

Almost surely, 2^28031436 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 28031436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37877112).

28031436 is an abundant number, since it is smaller than the sum of its proper divisors (47722788).

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

28031436 is a wasteful number, since it uses less digits than its factorization.

28031436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28031436 is about 5294.4722116562. The cubic root of 28031436 is about 303.7724954127.

The spelling of 28031436 in words is "twenty-eight million, thirty-one thousand, four hundred thirty-six".