28311738 has 32 divisors (see below), whose sum is σ = 69691776. Its totient is φ = 7466688.

The previous prime is 28311737. The next prime is 28311757. The reversal of 28311738 is 83711382.

It is a junction number, because it is equal to n+sod(n) for n = 28311699 and 28311708.

It is not an unprimeable number, because it can be changed into a prime (28311737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25381 + ... + 26472.

It is an arithmetic number, because the mean of its divisors is an integer number (2177868).

Almost surely, 2^28311738 is an apocalyptic number.

28311738 is an abundant number, since it is smaller than the sum of its proper divisors (41380038).

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

28311738 is a wasteful number, since it uses less digits than its factorization.

28311738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51878.

The product of its digits is 8064, while the sum is 33.

The square root of 28311738 is about 5320.8775592002. The cubic root of 28311738 is about 304.7816694221.

It can be divided in two parts, 283 and 11738, that added together give a palindrome (12021).

The spelling of 28311738 in words is "twenty-eight million, three hundred eleven thousand, seven hundred thirty-eight".