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28748757 = 39582919
BaseRepresentation
bin110110110101…
…0101111010101
32000002120212210
41231222233111
524324430012
62504104033
7466234422
oct155525725
960076783
1028748757
1115256404
129765019
135c575cb
143b64d49
1527cd23c
hex1b6abd5

28748757 has 4 divisors (see below), whose sum is σ = 38331680. Its totient is φ = 19165836.

The previous prime is 28748743. The next prime is 28748761. The reversal of 28748757 is 75784782.

It is a happy number.

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 not a de Polignac number, because 28748757 - 26 = 28748693 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 (28748777) 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, 4791457 + ... + 4791462.

It is an arithmetic number, because the mean of its divisors is an integer number (9582920).

Almost surely, 228748757 is an apocalyptic number.

It is an amenable number.

28748757 is a deficient number, since it is larger than the sum of its proper divisors (9582923).

28748757 is an equidigital number, since it uses as much as digits as its factorization.

28748757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9582922.

The product of its digits is 878080, while the sum is 48.

The square root of 28748757 is about 5361.7867357813. The cubic root of 28748757 is about 306.3418687595.

The spelling of 28748757 in words is "twenty-eight million, seven hundred forty-eight thousand, seven hundred fifty-seven".

Divisors: 1 3 9582919 28748757