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72913 = 174289
BaseRepresentation
bin10001110011010001
310201000111
4101303101
54313123
61321321
7422401
oct216321
9121014
1072913
114a865
1236241
1327259
141c801
151690d
hex11cd1

72913 has 4 divisors (see below), whose sum is σ = 77220. Its totient is φ = 68608.

The previous prime is 72911. The next prime is 72923. The reversal of 72913 is 31927.

72913 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31927 = 74561.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 9409 = 252^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 72913 - 21 = 72911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72911) 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, 2128 + ... + 2161.

It is an arithmetic number, because the mean of its divisors is an integer number (19305).

272913 is an apocalyptic number.

It is an amenable number.

72913 is a deficient number, since it is larger than the sum of its proper divisors (4307).

72913 is a wasteful number, since it uses less digits than its factorization.

72913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its digits is 378, while the sum is 22.

The square root of 72913 is about 270.0240730009. The cubic root of 72913 is about 41.7767825094.

The spelling of 72913 in words is "seventy-two thousand, nine hundred thirteen".

Divisors: 1 17 4289 72913