55142690 has 16 divisors (see below), whose sum is σ = 99973440. Its totient is φ = 21897840.

The previous prime is 55142687. The next prime is 55142699. The reversal of 55142690 is 9624155.

It is a happy number.

It is a super-2 number, since 2×55142690² = 6081432520872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55142699) 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, 18446 + ... + 21225.

It is an arithmetic number, because the mean of its divisors is an integer number (6248340).

Almost surely, 2^55142690 is an apocalyptic number.

55142690 is a deficient number, since it is larger than the sum of its proper divisors (44830750).

55142690 is a wasteful number, since it uses less digits than its factorization.

55142690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39817.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 55142690 is about 7425.8124134670. The cubic root of 55142690 is about 380.6238367976.

The spelling of 55142690 in words is "fifty-five million, one hundred forty-two thousand, six hundred ninety".