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28551685331 = 132196283487
BaseRepresentation
bin11010100101110100…
…000010010011010011
32201200211000220011002
4122211310002103103
5431433212412311
621041053412215
72030352215051
oct324564022323
981624026132
1028551685331
1111121755864
125649a9a06b
1329002cb380
14154bd5b1d1
15b218dd93b
hex6a5d024d3

28551685331 has 4 divisors (see below), whose sum is σ = 30747968832. Its totient is φ = 26355401832.

The previous prime is 28551685297. The next prime is 28551685343. The reversal of 28551685331 is 13358615582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28551685331 is a prime.

It is a super-2 number, since 2×285516853312 (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28551685231) 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, 1098141731 + ... + 1098141756.

It is an arithmetic number, because the mean of its divisors is an integer number (7686992208).

Almost surely, 228551685331 is an apocalyptic number.

28551685331 is a deficient number, since it is larger than the sum of its proper divisors (2196283501).

28551685331 is a wasteful number, since it uses less digits than its factorization.

28551685331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196283500.

The product of its digits is 864000, while the sum is 47.

The spelling of 28551685331 in words is "twenty-eight billion, five hundred fifty-one million, six hundred eighty-five thousand, three hundred thirty-one".

Divisors: 1 13 2196283487 28551685331