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55644140 = 2253737459
BaseRepresentation
bin1101010001000…
…0111111101100
310212201000102002
43110100333230
5103221103030
65304351432
71243652546
oct324207754
9125630362
1055644140
11294562a2
1216775578
13b6b3436
147566696
154d42245
hex3510fec

55644140 has 24 divisors (see below), whose sum is σ = 117181680. Its totient is φ = 22195008.

The previous prime is 55644137. The next prime is 55644143. The reversal of 55644140 is 4144655.

It is an interprime number because it is at equal distance from previous prime (55644137) and next prime (55644143).

It is not an unprimeable number, because it can be changed into a prime (55644143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3731 + ... + 11189.

It is an arithmetic number, because the mean of its divisors is an integer number (4882570).

Almost surely, 255644140 is an apocalyptic number.

It is a pronic number, being equal to 7459×7460.

It is an amenable number.

55644140 is an abundant number, since it is smaller than the sum of its proper divisors (61537540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55644140 is a wasteful number, since it uses less digits than its factorization.

55644140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7841 (or 7839 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 55644140 is about 7459.4999832428. The cubic root of 55644140 is about 381.7741142366.

Adding to 55644140 its reverse (4144655), we get a palindrome (59788795).

The spelling of 55644140 in words is "fifty-five million, six hundred forty-four thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 373 746 1492 1865 3730 7459 7460 14918 29836 37295 74590 149180 2782207 5564414 11128828 13911035 27822070 55644140