28991950 has 72 divisors (see below), whose sum is σ = 60451488. Its totient is φ = 10333440.

The previous prime is 28991947. The next prime is 28991969. The reversal of 28991950 is 5919982.

It is a junction number, because it is equal to n+sod(n) for n = 28991897 and 28991906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 397114 + ... + 397186.

It is an arithmetic number, because the mean of its divisors is an integer number (839604).

Almost surely, 2^28991950 is an apocalyptic number.

28991950 is an abundant number, since it is smaller than the sum of its proper divisors (31459538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28991950 is a wasteful number, since it uses less digits than its factorization.

28991950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 28991950 is about 5384.4173315225. The cubic root of 28991950 is about 307.2032521787.

The spelling of 28991950 in words is "twenty-eight million, nine hundred ninety-one thousand, nine hundred fifty".