28929819 has 8 divisors (see below), whose sum is σ = 39615760. Its totient is φ = 18765216.

The previous prime is 28929811. The next prime is 28929829. The reversal of 28929819 is 91892982.

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

It is not a de Polignac number, because 28929819 - 2³ = 28929811 is a prime.

It is a super-2 number, since 2×28929819² = 1673868854745522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28929811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130204 + ... + 130425.

It is an arithmetic number, because the mean of its divisors is an integer number (4951970).

Almost surely, 2^28929819 is an apocalyptic number.

28929819 is a deficient number, since it is larger than the sum of its proper divisors (10685941).

28929819 is a wasteful number, since it uses less digits than its factorization.

28929819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260669.

The product of its digits is 186624, while the sum is 48.

The square root of 28929819 is about 5378.6447177705. The cubic root of 28929819 is about 306.9836452859.

The spelling of 28929819 in words is "twenty-eight million, nine hundred twenty-nine thousand, eight hundred nineteen".