28671644 has 6 divisors (see below), whose sum is σ = 50175384. Its totient is φ = 14335820.

The previous prime is 28671637. The next prime is 28671653. The reversal of 28671644 is 44617682.

It is a junction number, because it is equal to n+sod(n) for n = 28671598 and 28671607.

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, 3583952 + ... + 3583959.

It is an arithmetic number, because the mean of its divisors is an integer number (8362564).

Almost surely, 2^28671644 is an apocalyptic number.

It is an amenable number.

28671644 is a deficient number, since it is larger than the sum of its proper divisors (21503740).

28671644 is a wasteful number, since it uses less digits than its factorization.

28671644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7167915 (or 7167913 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 28671644 is about 5354.5909274192. The cubic root of 28671644 is about 306.0677224908.

The spelling of 28671644 in words is "twenty-eight million, six hundred seventy-one thousand, six hundred forty-four".