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72021007 = 292483483
BaseRepresentation
bin1000100101011…
…11010000001111
312000112001020201
410102233100033
5121414133012
611051354331
71533111532
oct422572017
9160461221
1072021007
11377214a3
12201529a7
1311bc86a6
1497caa19
1564c9857
hex44af40f

72021007 has 4 divisors (see below), whose sum is σ = 74504520. Its totient is φ = 69537496.

The previous prime is 72020989. The next prime is 72021013. The reversal of 72021007 is 70012027.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-72021007 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 (72021067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241713 + ... + 1241770.

It is an arithmetic number, because the mean of its divisors is an integer number (18626130).

Almost surely, 272021007 is an apocalyptic number.

72021007 is a deficient number, since it is larger than the sum of its proper divisors (2483513).

72021007 is a wasteful number, since it uses less digits than its factorization.

72021007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483512.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 72021007 is about 8486.5191333078. The cubic root of 72021007 is about 416.0572202325.

The spelling of 72021007 in words is "seventy-two million, twenty-one thousand, seven".

Divisors: 1 29 2483483 72021007