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28699487 = 97295871
BaseRepresentation
bin110110101111…
…0101101011111
32000000002021222
41231132231133
524321340422
62503043555
7465640655
oct155365537
960002258
1028699487
1115222393
1297405bb
135c3b05b
143b50dd5
1527bd842
hex1b5eb5f

28699487 has 4 divisors (see below), whose sum is σ = 28995456. Its totient is φ = 28403520.

The previous prime is 28699483. The next prime is 28699499. The reversal of 28699487 is 78499682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28699487 - 22 = 28699483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28699483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147839 + ... + 148032.

It is an arithmetic number, because the mean of its divisors is an integer number (7248864).

Almost surely, 228699487 is an apocalyptic number.

28699487 is a deficient number, since it is larger than the sum of its proper divisors (295969).

28699487 is an equidigital number, since it uses as much as digits as its factorization.

28699487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295968.

The product of its digits is 1741824, while the sum is 53.

The square root of 28699487 is about 5357.1902150288. The cubic root of 28699487 is about 306.1667644404.

The spelling of 28699487 in words is "twenty-eight million, six hundred ninety-nine thousand, four hundred eighty-seven".

Divisors: 1 97 295871 28699487