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BaseRepresentation
bin11010001000010111…
…101111110111101001
32200102101120101120002
4122020113233313221
5424430234334122
620520050312345
72012203526444
oct321027576751
980371511502
1028057730537
1110998948261
1255305886b5
132851b81a25
1415024da65b
15ae336b992
hex6885efde9

28057730537 has 4 divisors (see below), whose sum is σ = 28169514576. Its totient is φ = 27945946500.

The previous prime is 28057730527. The next prime is 28057730557. The reversal of 28057730537 is 73503775082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28057730537 - 234 = 10877861353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28057730491 and 28057730500.

It is not an unprimeable number, because it can be changed into a prime (28057730507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55891643 + ... + 55892144.

It is an arithmetic number, because the mean of its divisors is an integer number (7042378644).

Almost surely, 228057730537 is an apocalyptic number.

It is an amenable number.

28057730537 is a deficient number, since it is larger than the sum of its proper divisors (111784039).

28057730537 is a wasteful number, since it uses less digits than its factorization.

28057730537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111784038.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 28057730537 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, five hundred thirty-seven".

Divisors: 1 251 111783787 28057730537