28939851 has 6 divisors (see below), whose sum is σ = 41802020. Its totient is φ = 19293228.

The previous prime is 28939847. The next prime is 28939877. The reversal of 28939851 is 15893982.

It is a happy number.

It is not a de Polignac number, because 28939851 - 2² = 28939847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28939797 and 28939806.

It is not an unprimeable number, because it can be changed into a prime (28939811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1607761 + ... + 1607778.

Almost surely, 2^28939851 is an apocalyptic number.

28939851 is a deficient number, since it is larger than the sum of its proper divisors (12862169).

28939851 is a wasteful number, since it uses less digits than its factorization.

28939851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215545 (or 3215542 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28939851 is about 5379.5772138710. The cubic root of 28939851 is about 307.0191254482.

The spelling of 28939851 in words is "twenty-eight million, nine hundred thirty-nine thousand, eight hundred fifty-one".