28720126 has 8 divisors (see below), whose sum is σ = 43244784. Its totient is φ = 14305200.

The previous prime is 28720099. The next prime is 28720127. The reversal of 28720126 is 62102782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28720094 and 28720103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26775 + ... + 27826.

It is an arithmetic number, because the mean of its divisors is an integer number (5405598).

Almost surely, 2^28720126 is an apocalyptic number.

28720126 is a deficient number, since it is larger than the sum of its proper divisors (14524658).

28720126 is a wasteful number, since it uses less digits than its factorization.

28720126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54866.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 28720126 is about 5359.1161584724. The cubic root of 28720126 is about 306.2401392910.

The spelling of 28720126 in words is "twenty-eight million, seven hundred twenty thousand, one hundred twenty-six".