28729911001 has 27 divisors (see below), whose sum is σ = 33369842709. Its totient is φ = 24712954200.

The previous prime is 28729910977. The next prime is 28729911011. The reversal of 28729911001 is 10011992782.

The square root of 28729911001 is 169499.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28729911001 - 2¹⁹ = 28729386713 is a prime.

It is a super-2 number, since 2×28729911001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28729911011) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 35424886 + ... + 35425696.

Almost surely, 2^28729911001 is an apocalyptic number.

28729911001 is the 169499-th square number.

28729911001 is the 84750-th centered octagonal number.

It is an amenable number.

28729911001 is a deficient number, since it is larger than the sum of its proper divisors (4639931708).

28729911001 is an frugal number, since it uses more digits than its factorization.

28729911001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 28729911001 in words is "twenty-eight billion, seven hundred twenty-nine million, nine hundred eleven thousand, one".