28971700 has 18 divisors (see below), whose sum is σ = 62868806. Its totient is φ = 11588640.

The previous prime is 28971643. The next prime is 28971721. The reversal of 28971700 is 717982.

It can be written as a sum of positive squares in 3 ways, for example, as 5776 + 28965924 = 76^2 + 5382^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144759 + ... + 144958.

Almost surely, 2^28971700 is an apocalyptic number.

28971700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28971700 is an abundant number, since it is smaller than the sum of its proper divisors (33897106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28971700 is a wasteful number, since it uses less digits than its factorization.

28971700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289731 (or 289724 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 28971700 is about 5382.5365767452. The cubic root of 28971700 is about 307.1317114604.

The spelling of 28971700 in words is "twenty-eight million, nine hundred seventy-one thousand, seven hundred".