28380532 has 6 divisors (see below), whose sum is σ = 49665938. Its totient is φ = 14190264.

The previous prime is 28380523. The next prime is 28380553. The reversal of 28380532 is 23508382.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 7986276 = 4516^2 + 2826^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28380494 and 28380503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3547563 + ... + 3547570.

Almost surely, 2^28380532 is an apocalyptic number.

It is an amenable number.

28380532 is a deficient number, since it is larger than the sum of its proper divisors (21285406).

28380532 is a wasteful number, since it uses less digits than its factorization.

28380532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095137 (or 7095135 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 28380532 is about 5327.3381721081. The cubic root of 28380532 is about 305.0283302539.

The spelling of 28380532 in words is "twenty-eight million, three hundred eighty thousand, five hundred thirty-two".