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72449971 = 1117387433
BaseRepresentation
bin1000101000101…
…11111110110011
312001022211200021
410110113332303
5122021344341
611104504311
71536546256
oct424277663
9161284607
1072449971
1137994810
122031b097
1312018a09
14989d09d
1565619d1
hex4517fb3

72449971 has 8 divisors (see below), whose sum is σ = 83685744. Its totient is φ = 61989120.

The previous prime is 72449963. The next prime is 72449987. The reversal of 72449971 is 17994427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72449971 - 23 = 72449963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72449921) 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, 193530 + ... + 193903.

It is an arithmetic number, because the mean of its divisors is an integer number (10460718).

Almost surely, 272449971 is an apocalyptic number.

72449971 is a deficient number, since it is larger than the sum of its proper divisors (11235773).

72449971 is a wasteful number, since it uses less digits than its factorization.

72449971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387461.

The product of its digits is 127008, while the sum is 43.

The square root of 72449971 is about 8511.7548719403. The cubic root of 72449971 is about 416.8816111959.

The spelling of 72449971 in words is "seventy-two million, four hundred forty-nine thousand, nine hundred seventy-one".

Divisors: 1 11 17 187 387433 4261763 6586361 72449971