55136687 has 4 divisors (see below), whose sum is σ = 56309856. Its totient is φ = 53963520.

The previous prime is 55136671. The next prime is 55136699. The reversal of 55136687 is 78663155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55136687 - 2⁴ = 55136671 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 (55136647) 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, 586514 + ... + 586607.

It is an arithmetic number, because the mean of its divisors is an integer number (14077464).

Almost surely, 2^55136687 is an apocalyptic number.

55136687 is a deficient number, since it is larger than the sum of its proper divisors (1173169).

55136687 is a wasteful number, since it uses less digits than its factorization.

55136687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173168.

The product of its digits is 151200, while the sum is 41.

The square root of 55136687 is about 7425.4082042673. The cubic root of 55136687 is about 380.6100243424.

The spelling of 55136687 in words is "fifty-five million, one hundred thirty-six thousand, six hundred eighty-seven".