28387432 has 8 divisors (see below), whose sum is σ = 53226450. Its totient is φ = 14193712.

The previous prime is 28387423. The next prime is 28387441. The reversal of 28387432 is 23478382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28387423) and next prime (28387441).

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 10797796 = 4194^2 + 3286^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28387391 and 28387400.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1774207 + ... + 1774222.

Almost surely, 2^28387432 is an apocalyptic number.

It is an amenable number.

28387432 is a deficient number, since it is larger than the sum of its proper divisors (24839018).

28387432 is a wasteful number, since it uses less digits than its factorization.

28387432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548435 (or 3548431 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 28387432 is about 5327.9857357166. The cubic root of 28387432 is about 305.0530481947.

The spelling of 28387432 in words is "twenty-eight million, three hundred eighty-seven thousand, four hundred thirty-two".