28619651 has 4 divisors (see below), whose sum is σ = 28648704. Its totient is φ = 28590600.

The previous prime is 28619627. The next prime is 28619677. The reversal of 28619651 is 15691682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28619651 - 2²² = 24425347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28619951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12995 + ... + 15036.

It is an arithmetic number, because the mean of its divisors is an integer number (7162176).

Almost surely, 2^28619651 is an apocalyptic number.

28619651 is a deficient number, since it is larger than the sum of its proper divisors (29053).

28619651 is a wasteful number, since it uses less digits than its factorization.

28619651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29052.

The product of its digits is 25920, while the sum is 38.

The square root of 28619651 is about 5349.7337316917. The cubic root of 28619651 is about 305.8826033782.

The spelling of 28619651 in words is "twenty-eight million, six hundred nineteen thousand, six hundred fifty-one".