28720941 has 8 divisors (see below), whose sum is σ = 38516640. Its totient is φ = 19036272.

The previous prime is 28720931. The next prime is 28720949. The reversal of 28720941 is 14902782.

It is a happy number.

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

It is not a de Polignac number, because 28720941 - 2¹⁵ = 28688173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27151 + ... + 28188.

It is an arithmetic number, because the mean of its divisors is an integer number (4814580).

Almost surely, 2^28720941 is an apocalyptic number.

It is an amenable number.

28720941 is a deficient number, since it is larger than the sum of its proper divisors (9795699).

28720941 is a wasteful number, since it uses less digits than its factorization.

28720941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55515.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28720941 is about 5359.1921965908. The cubic root of 28720941 is about 306.2430360210.

The spelling of 28720941 in words is "twenty-eight million, seven hundred twenty thousand, nine hundred forty-one".