28990726 has 4 divisors (see below), whose sum is σ = 43486092. Its totient is φ = 14495362.

The previous prime is 28990711. The next prime is 28990727. The reversal of 28990726 is 62709982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62709982 = 2 ⋅31354991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990727) 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 as a sum of consecutive naturals, namely, 7247680 + ... + 7247683.

It is an arithmetic number, because the mean of its divisors is an integer number (10871523).

Almost surely, 2^28990726 is an apocalyptic number.

28990726 is a deficient number, since it is larger than the sum of its proper divisors (14495366).

28990726 is a wasteful number, since it uses less digits than its factorization.

28990726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14495365.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 28990726 is about 5384.3036689994. The cubic root of 28990726 is about 307.1989288858.

The spelling of 28990726 in words is "twenty-eight million, nine hundred ninety thousand, seven hundred twenty-six".