Base | Representation |
---|---|

bin | 110010000101010 |

3 | 1022011201 |

4 | 12100222 |

5 | 1310032 |

6 | 314414 |

7 | 134521 |

oct | 62052 |

9 | 38151 |

10 | 25642 |

11 | 182a1 |

12 | 12a0a |

13 | b896 |

14 | 94b8 |

15 | 78e7 |

hex | 642a |

25642 has 4 divisors (see below), whose sum is σ = 38466. Its totient is φ = 12820.

The previous prime is 25639. The next prime is 25643. The reversal of 25642 is 24652.

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

It can be written as a sum of positive squares in only one way, i.e., 25281 + 361 = 159^2 + 19^2 .

It is not an unprimeable number, because it can be changed into a prime (25643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6409 + ... + 6412.

2^{25642} is an apocalyptic number.

25642 is a deficient number, since it is larger than the sum of its proper divisors (12824).

25642 is a wasteful number, since it uses less digits than its factorization.

25642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12823.

The product of its digits is 480, while the sum is 19.

The square root of 25642 is about 160.1311962111. The cubic root of 25642 is about 29.4883608206.

Subtracting from 25642 its reverse (24652), we obtain a triangular number (990 = T_{44}).

The spelling of 25642 in words is "twenty-five thousand, six hundred forty-two".

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