55771438 has 8 divisors (see below), whose sum is σ = 83849040. Its totient is φ = 27821760.

The previous prime is 55771433. The next prime is 55771451. The reversal of 55771438 is 83417755.

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

It is a super-2 number, since 2×55771438² = 6220906593175688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55771438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55771433) 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 3 ways as a sum of consecutive naturals, for example, 30883 + ... + 32638.

It is an arithmetic number, because the mean of its divisors is an integer number (10481130).

Almost surely, 2^55771438 is an apocalyptic number.

55771438 is a deficient number, since it is larger than the sum of its proper divisors (28077602).

55771438 is a wasteful number, since it uses less digits than its factorization.

55771438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63962.

The product of its digits is 117600, while the sum is 40.

The square root of 55771438 is about 7468.0277182132. The cubic root of 55771438 is about 382.0650227846.

The spelling of 55771438 in words is "fifty-five million, seven hundred seventy-one thousand, four hundred thirty-eight".