28591964 has 6 divisors (see below), whose sum is σ = 50035944. Its totient is φ = 14295980.

The previous prime is 28591961. The next prime is 28591973. The reversal of 28591964 is 46919582.

28591964 = 1887² + 1888² + ... + 1894².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28591961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3573992 + ... + 3573999.

It is an arithmetic number, because the mean of its divisors is an integer number (8339324).

Almost surely, 2^28591964 is an apocalyptic number.

It is an amenable number.

28591964 is a deficient number, since it is larger than the sum of its proper divisors (21443980).

28591964 is a wasteful number, since it uses less digits than its factorization.

28591964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7147995 (or 7147993 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 28591964 is about 5347.1454066633. The cubic root of 28591964 is about 305.7839333641.

The spelling of 28591964 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred sixty-four".