28720653 has 16 divisors (see below), whose sum is σ = 41521536. Its totient is φ = 17553600.

The previous prime is 28720651. The next prime is 28720661. The reversal of 28720653 is 35602782.

It is not a de Polignac number, because 28720653 - 2¹ = 28720651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3451 + ... + 8327.

It is an arithmetic number, because the mean of its divisors is an integer number (2595096).

Almost surely, 2^28720653 is an apocalyptic number.

It is an amenable number.

28720653 is a deficient number, since it is larger than the sum of its proper divisors (12800883).

28720653 is a wasteful number, since it uses less digits than its factorization.

28720653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5044.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 28720653 is about 5359.1653268023. The cubic root of 28720653 is about 306.2420123975.

The spelling of 28720653 in words is "twenty-eight million, seven hundred twenty thousand, six hundred fifty-three".