28720102 has 8 divisors (see below), whose sum is σ = 43996896. Its totient is φ = 14054472.

The previous prime is 28720099. The next prime is 28720127. The reversal of 28720102 is 20102782.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152673 + ... + 152860.

It is an arithmetic number, because the mean of its divisors is an integer number (5499612).

Almost surely, 2^28720102 is an apocalyptic number.

28720102 is a deficient number, since it is larger than the sum of its proper divisors (15276794).

28720102 is a wasteful number, since it uses less digits than its factorization.

28720102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305582.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 28720102 is about 5359.1139192967. The cubic root of 28720102 is about 306.2400539877.

Adding to 28720102 its reverse (20102782), we get a palindrome (48822884).

The spelling of 28720102 in words is "twenty-eight million, seven hundred twenty thousand, one hundred two".