55807138 has 8 divisors (see below), whose sum is σ = 83768832. Its totient is φ = 27884196.

The previous prime is 55807127. The next prime is 55807139. The reversal of 55807138 is 83170855.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55807138² = 6228873303502088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55807097 and 55807106.

It is not an unprimeable number, because it can be changed into a prime (55807139) 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, 5770 + ... + 12037.

It is an arithmetic number, because the mean of its divisors is an integer number (10471104).

Almost surely, 2^55807138 is an apocalyptic number.

55807138 is a deficient number, since it is larger than the sum of its proper divisors (27961694).

55807138 is a wasteful number, since it uses less digits than its factorization.

55807138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19376.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55807138 is about 7470.4175251454. The cubic root of 55807138 is about 382.1465269411.

It can be divided in two parts, 55807 and 138, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 55807138 in words is "fifty-five million, eight hundred seven thousand, one hundred thirty-eight".