28331430 has 32 divisors (see below), whose sum is σ = 68191200. Its totient is φ = 7533312.

The previous prime is 28331417. The next prime is 28331437. The reversal of 28331430 is 3413382.

It is a self number, because there is not a number n which added to its sum of digits gives 28331430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331437) 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, 11116 + ... + 13424.

It is an arithmetic number, because the mean of its divisors is an integer number (2130975).

Almost surely, 2^28331430 is an apocalyptic number.

28331430 is an abundant number, since it is smaller than the sum of its proper divisors (39859770).

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

28331430 is a wasteful number, since it uses less digits than its factorization.

28331430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 28331430 is about 5322.7276841860. The cubic root of 28331430 is about 304.8523158524.

It can be divided in two parts, 283 and 31430, that added together give a palindrome (31713).

The spelling of 28331430 in words is "twenty-eight million, three hundred thirty-one thousand, four hundred thirty".