28973658 has 64 divisors (see below), whose sum is σ = 69138432. Its totient is φ = 7922880.

The previous prime is 28973657. The next prime is 28973671. The reversal of 28973658 is 85637982.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28973657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110035 + ... + 110297.

It is an arithmetic number, because the mean of its divisors is an integer number (1080288).

Almost surely, 2^28973658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28973658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34569216).

28973658 is an abundant number, since it is smaller than the sum of its proper divisors (40164774).

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

28973658 is a wasteful number, since it uses less digits than its factorization.

28973658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its digits is 725760, while the sum is 48.

The square root of 28973658 is about 5382.7184581771. The cubic root of 28973658 is about 307.1386302851.

It can be divided in two parts, 2897 and 3658, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 28973658 in words is "twenty-eight million, nine hundred seventy-three thousand, six hundred fifty-eight".