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71990 = 2523313
BaseRepresentation
bin10001100100110110
310122202022
4101210312
54300430
61313142
7416612
oct214466
9118668
1071990
114a0a6
12357b2
13269c9
141c342
15164e5
hex11936

71990 has 16 divisors (see below), whose sum is σ = 135648. Its totient is φ = 27456.

The previous prime is 71987. The next prime is 71993. The reversal of 71990 is 9917.

It is an interprime number because it is at equal distance from previous prime (71987) and next prime (71993).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74 + ... + 386.

It is an arithmetic number, because the mean of its divisors is an integer number (8478).

271990 is an apocalyptic number.

71990 is a deficient number, since it is larger than the sum of its proper divisors (63658).

71990 is a wasteful number, since it uses less digits than its factorization.

71990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 71990 is about 268.3095227531. The cubic root of 71990 is about 41.5997503683.

The spelling of 71990 in words is "seventy-one thousand, nine hundred ninety".

Divisors: 1 2 5 10 23 46 115 230 313 626 1565 3130 7199 14398 35995 71990