28641945 has 8 divisors (see below), whose sum is σ = 45827136. Its totient is φ = 15275696.

The previous prime is 28641917. The next prime is 28641953. The reversal of 28641945 is 54914682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28641945 - 2⁶ = 28641881 is a prime.

It is a super-2 number, since 2×28641945² = 1640722026766050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954717 + ... + 954746.

It is an arithmetic number, because the mean of its divisors is an integer number (5728392).

Almost surely, 2^28641945 is an apocalyptic number.

It is an amenable number.

28641945 is a deficient number, since it is larger than the sum of its proper divisors (17185191).

28641945 is a wasteful number, since it uses less digits than its factorization.

28641945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909471.

The product of its digits is 69120, while the sum is 39.

The square root of 28641945 is about 5351.8169811756. The cubic root of 28641945 is about 305.9620077570.

The spelling of 28641945 in words is "twenty-eight million, six hundred forty-one thousand, nine hundred forty-five".