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57288139687 = 672833021367
BaseRepresentation
bin110101010110101000…
…111010001110100111
312110212111202000202101
4311112220322032213
51414311230432222
642152351352531
74065440103262
oct652650721647
9173774660671
1057288139687
1122328730299
12b129822747
13552c98020c
142ab6653cd9
151754628927
hexd56a3a3a7

57288139687 has 8 divisors (see below), whose sum is σ = 58348658816. Its totient is φ = 56233663992.

The previous prime is 57288139651. The next prime is 57288139729. The reversal of 57288139687 is 78693188275.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-57288139687 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 (57288139187) 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, 1491723 + ... + 1529644.

It is an arithmetic number, because the mean of its divisors is an integer number (7293582352).

Almost surely, 257288139687 is an apocalyptic number.

57288139687 is a deficient number, since it is larger than the sum of its proper divisors (1060519129).

57288139687 is a wasteful number, since it uses less digits than its factorization.

57288139687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021717.

The product of its digits is 40642560, while the sum is 64.

The spelling of 57288139687 in words is "fifty-seven billion, two hundred eighty-eight million, one hundred thirty-nine thousand, six hundred eighty-seven".

Divisors: 1 67 283 18961 3021367 202431589 855046861 57288139687