28049970 has 64 divisors (see below), whose sum is σ = 73592064. Its totient is φ = 6800640.

The previous prime is 28049969. The next prime is 28049971. The reversal of 28049970 is 7994082.

It is an interprime number because it is at equal distance from previous prime (28049969) and next prime (28049971).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28049971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27184 + ... + 28196.

It is an arithmetic number, because the mean of its divisors is an integer number (1149876).

Almost surely, 2^28049970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28049970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36796032).

28049970 is an abundant number, since it is smaller than the sum of its proper divisors (45542094).

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

28049970 is a wasteful number, since it uses less digits than its factorization.

28049970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28049970 is about 5296.2222385395. Note that the first 4 decimals coincide. The cubic root of 28049970 is about 303.8394307281.

The spelling of 28049970 in words is "twenty-eight million, forty-nine thousand, nine hundred seventy".