28981646 has 4 divisors (see below), whose sum is σ = 43472472. Its totient is φ = 14490822.

The previous prime is 28981637. The next prime is 28981661. The reversal of 28981646 is 64618982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64618982 = 2 ⋅32309491.

It is a junction number, because it is equal to n+sod(n) for n = 28981597 and 28981606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7245410 + ... + 7245413.

It is an arithmetic number, because the mean of its divisors is an integer number (10868118).

Almost surely, 2^28981646 is an apocalyptic number.

28981646 is a deficient number, since it is larger than the sum of its proper divisors (14490826).

28981646 is a wasteful number, since it uses less digits than its factorization.

28981646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14490825.

The product of its digits is 165888, while the sum is 44.

The square root of 28981646 is about 5383.4604112968. The cubic root of 28981646 is about 307.1668535992.

The spelling of 28981646 in words is "twenty-eight million, nine hundred eighty-one thousand, six hundred forty-six".