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72708631 = 467155693
BaseRepresentation
bin1000101010101…
…11001000010111
312001210222111021
410111113020113
5122103134011
611114222011
71542004342
oct425271027
9161728437
1072708631
1138051086
1220424907
13120a9678
149929459
1565b3471
hex4557217

72708631 has 4 divisors (see below), whose sum is σ = 72864792. Its totient is φ = 72552472.

The previous prime is 72708619. The next prime is 72708653. The reversal of 72708631 is 13680727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13680727 = 129110597.

It is a cyclic number.

It is not a de Polignac number, because 72708631 - 211 = 72706583 is a prime.

It is a super-2 number, since 2×727086312 = 10573090043788322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72708661) 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, 77380 + ... + 78313.

It is an arithmetic number, because the mean of its divisors is an integer number (18216198).

Almost surely, 272708631 is an apocalyptic number.

72708631 is a deficient number, since it is larger than the sum of its proper divisors (156161).

72708631 is a wasteful number, since it uses less digits than its factorization.

72708631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156160.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 72708631 is about 8526.9356160346. The cubic root of 72708631 is about 417.3771371652.

The spelling of 72708631 in words is "seventy-two million, seven hundred eight thousand, six hundred thirty-one".

Divisors: 1 467 155693 72708631