28403912 has 8 divisors (see below), whose sum is σ = 53257350. Its totient is φ = 14201952.

The previous prime is 28403863. The next prime is 28403929. The reversal of 28403912 is 21930482.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 37636 = 5326^2 + 194^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775237 + ... + 1775252.

Almost surely, 2^28403912 is an apocalyptic number.

It is an amenable number.

28403912 is a deficient number, since it is larger than the sum of its proper divisors (24853438).

28403912 is a wasteful number, since it uses less digits than its factorization.

28403912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550495 (or 3550491 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28403912 is about 5329.5320620107. The cubic root of 28403912 is about 305.1120684647.

The spelling of 28403912 in words is "twenty-eight million, four hundred three thousand, nine hundred twelve".