28223732 has 6 divisors (see below), whose sum is σ = 49391538. Its totient is φ = 14111864.

The previous prime is 28223731. The next prime is 28223761. The reversal of 28223732 is 23732282.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 3083536 = 5014^2 + 1756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28223695 and 28223704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3527963 + ... + 3527970.

It is an arithmetic number, because the mean of its divisors is an integer number (8231923).

Almost surely, 2^28223732 is an apocalyptic number.

It is an amenable number.

28223732 is a deficient number, since it is larger than the sum of its proper divisors (21167806).

28223732 is a wasteful number, since it uses less digits than its factorization.

28223732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055937 (or 7055935 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 28223732 is about 5312.6012460940. The cubic root of 28223732 is about 304.4655407541.

The spelling of 28223732 in words is "twenty-eight million, two hundred twenty-three thousand, seven hundred thirty-two".