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55645778 = 2671073881
BaseRepresentation
bin1101010001000…
…1011001010010
310212201002122202
43110101121102
5103221131103
65304403202
71243660406
oct324213122
9125632582
1055645778
1129457551
1216776502
13b6b40c6
147567106
154d42988
hex3511652

55645778 has 16 divisors (see below), whose sum is σ = 85528224. Its totient is φ = 27144480.

The previous prime is 55645771. The next prime is 55645781. The reversal of 55645778 is 87754655.

It is not an unprimeable number, because it can be changed into a prime (55645771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12398 + ... + 16278.

It is an arithmetic number, because the mean of its divisors is an integer number (5345514).

Almost surely, 255645778 is an apocalyptic number.

55645778 is a deficient number, since it is larger than the sum of its proper divisors (29882446).

55645778 is a wasteful number, since it uses less digits than its factorization.

55645778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057.

The product of its digits is 1176000, while the sum is 47.

The square root of 55645778 is about 7459.6097753167. The cubic root of 55645778 is about 381.7778603026. Note that the first 3 decimals are identical.

The spelling of 55645778 in words is "fifty-five million, six hundred forty-five thousand, seven hundred seventy-eight".