55142820 has 36 divisors (see below), whose sum is σ = 167267100. Its totient is φ = 14704704.

The previous prime is 55142819. The next prime is 55142873. The reversal of 55142820 is 2824155.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25462116 + 29680704 = 5046^2 + 5448^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152995 + ... + 153354.

Almost surely, 2^55142820 is an apocalyptic number.

It is an amenable number.

55142820 is an abundant number, since it is smaller than the sum of its proper divisors (112124280).

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

55142820 is a wasteful number, since it uses less digits than its factorization.

55142820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306364 (or 306359 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 55142820 is about 7425.8211667128. The cubic root of 55142820 is about 380.6241359069.

Adding to 55142820 its reverse (2824155), we get a palindrome (57966975).

The spelling of 55142820 in words is "fifty-five million, one hundred forty-two thousand, eight hundred twenty".