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28913750 = 25423131
BaseRepresentation
bin110111001001…
…1000001010110
32000101222012122
41232103001112
524400220000
62511415542
7500522435
oct156230126
960358178
1028913750
1115359368
1298245b2
135cb4738
143ba911c
152812085
hex1b93056

28913750 has 20 divisors (see below), whose sum is σ = 54198276. Its totient is φ = 11565000.

The previous prime is 28913749. The next prime is 28913791. The reversal of 28913750 is 5731982.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28913750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10316 + ... + 12815.

Almost surely, 228913750 is an apocalyptic number.

28913750 is a deficient number, since it is larger than the sum of its proper divisors (25284526).

28913750 is an equidigital number, since it uses as much as digits as its factorization.

28913750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23153 (or 23138 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28913750 is about 5377.1507324976. The cubic root of 28913750 is about 306.9267969777.

The spelling of 28913750 in words is "twenty-eight million, nine hundred thirteen thousand, seven hundred fifty".

Divisors: 1 2 5 10 25 50 125 250 625 1250 23131 46262 115655 231310 578275 1156550 2891375 5782750 14456875 28913750