28719646 has 4 divisors (see below), whose sum is σ = 43079472. Its totient is φ = 14359822.

The previous prime is 28719631. The next prime is 28719661. The reversal of 28719646 is 64691782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64691782 = 2 ⋅32345891.

It is an interprime number because it is at equal distance from previous prime (28719631) and next prime (28719661).

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, 7179910 + ... + 7179913.

It is an arithmetic number, because the mean of its divisors is an integer number (10769868).

Almost surely, 2^28719646 is an apocalyptic number.

28719646 is a deficient number, since it is larger than the sum of its proper divisors (14359826).

28719646 is a wasteful number, since it uses less digits than its factorization.

28719646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14359825.

The product of its digits is 145152, while the sum is 43.

The square root of 28719646 is about 5359.0713747813. The cubic root of 28719646 is about 306.2384332158.

The spelling of 28719646 in words is "twenty-eight million, seven hundred nineteen thousand, six hundred forty-six".