28438632 has 24 divisors (see below), whose sum is σ = 77021490. Its totient is φ = 9479520.

The previous prime is 28438621. The next prime is 28438643. The reversal of 28438632 is 23683482.

It is an interprime number because it is at equal distance from previous prime (28438621) and next prime (28438643).

It can be written as a sum of positive squares in only one way, i.e., 17189316 + 11249316 = 4146^2 + 3354^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197419 + ... + 197562.

Almost surely, 2^28438632 is an apocalyptic number.

It is an amenable number.

28438632 is an abundant number, since it is smaller than the sum of its proper divisors (48582858).

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

28438632 is a wasteful number, since it uses less digits than its factorization.

28438632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394993 (or 394986 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28438632 is about 5332.7883888262. The cubic root of 28438632 is about 305.2363374688.

The spelling of 28438632 in words is "twenty-eight million, four hundred thirty-eight thousand, six hundred thirty-two".