28616919 has 8 divisors (see below), whose sum is σ = 38211840. Its totient is φ = 19049976.

The previous prime is 28616879. The next prime is 28616927. The reversal of 28616919 is 91961682.

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

It is not a de Polignac number, because 28616919 - 2⁸ = 28616663 is a prime.

It is a super-2 number, since 2×28616919² = 1637856106105122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28616519) 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, 4477 + ... + 8790.

It is an arithmetic number, because the mean of its divisors is an integer number (4776480).

Almost surely, 2^28616919 is an apocalyptic number.

28616919 is a deficient number, since it is larger than the sum of its proper divisors (9594921).

28616919 is a wasteful number, since it uses less digits than its factorization.

28616919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13989.

The product of its digits is 46656, while the sum is 42.

The square root of 28616919 is about 5349.4783857868. The cubic root of 28616919 is about 305.8728699977.

It can be divided in two parts, 286 and 16919, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 28616919 in words is "twenty-eight million, six hundred sixteen thousand, nine hundred nineteen".