Search a number
87928 = 2329379
BaseRepresentation
bin10101011101111000
311110121121
4111131320
510303203
61515024
7514231
oct253570
9143547
1087928
1160075
1242a74
1331039
1424088
151b0bd
hex15778

87928 has 16 divisors (see below), whose sum is σ = 171000. Its totient is φ = 42336.

The previous prime is 87917. The next prime is 87931. The reversal of 87928 is 82978.

It is a happy number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 87893 and 87902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43 + ... + 421.

287928 is an apocalyptic number.

87928 is the 159-th centered heptagonal number.

It is an amenable number.

87928 is a deficient number, since it is larger than the sum of its proper divisors (83072).

87928 is a wasteful number, since it uses less digits than its factorization.

87928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 410 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 87928 is about 296.5265586756. The cubic root of 87928 is about 44.4674677010.

Subtracting from 87928 its reverse (82978), we obtain a triangular number (4950 = T99).

The spelling of 87928 in words is "eighty-seven thousand, nine hundred twenty-eight".