28591946 has 4 divisors (see below), whose sum is σ = 42887922. Its totient is φ = 14295972.

The previous prime is 28591939. The next prime is 28591949. The reversal of 28591946 is 64919582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28504921 + 87025 = 5339^2 + 295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28591897 and 28591906.

It is not an unprimeable number, because it can be changed into a prime (28591949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7147985 + ... + 7147988.

Almost surely, 2^28591946 is an apocalyptic number.

28591946 is a deficient number, since it is larger than the sum of its proper divisors (14295976).

28591946 is a wasteful number, since it uses less digits than its factorization.

28591946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14295975.

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

The square root of 28591946 is about 5347.1437235219. The cubic root of 28591946 is about 305.7838691956.

The spelling of 28591946 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred forty-six".