28021950 has 240 divisors, whose sum is σ = 92364624. Its totient is φ = 6220800.

The previous prime is 28021949. The next prime is 28021963. The reversal of 28021950 is 5912082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 757332 + ... + 757368.

Almost surely, 2^28021950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28021950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46182312).

28021950 is an abundant number, since it is smaller than the sum of its proper divisors (64342674).

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

28021950 is a wasteful number, since it uses less digits than its factorization.

28021950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28021950 is about 5293.5762958514. The cubic root of 28021950 is about 303.7382254238.

The spelling of 28021950 in words is "twenty-eight million, twenty-one thousand, nine hundred fifty".