28464981 has 4 divisors (see below), whose sum is σ = 37953312. Its totient is φ = 18976652.

The previous prime is 28464973. The next prime is 28465001. The reversal of 28464981 is 18946482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28464981 - 2³ = 28464973 is a prime.

It is a super-2 number, since 2×28464981² = 1620510286660722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28464181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4744161 + ... + 4744166.

It is an arithmetic number, because the mean of its divisors is an integer number (9488328).

Almost surely, 2^28464981 is an apocalyptic number.

It is an amenable number.

28464981 is a deficient number, since it is larger than the sum of its proper divisors (9488331).

28464981 is an equidigital number, since it uses as much as digits as its factorization.

28464981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9488330.

The product of its digits is 110592, while the sum is 42.

The square root of 28464981 is about 5335.2582880307. The cubic root of 28464981 is about 305.3305776985.

The spelling of 28464981 in words is "twenty-eight million, four hundred sixty-four thousand, nine hundred eighty-one".