55771405 has 8 divisors (see below), whose sum is σ = 67678200. Its totient is φ = 44115456.

The previous prime is 55771381. The next prime is 55771409. The reversal of 55771405 is 50417755.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7064964 + 48706441 = 2658^2 + 6979^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55771405 is a prime.

It is a super-2 number, since 2×55771405² = 6220899231348050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55771409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62220 + ... + 63109.

It is an arithmetic number, because the mean of its divisors is an integer number (8459775).

Almost surely, 2^55771405 is an apocalyptic number.

It is an amenable number.

55771405 is a deficient number, since it is larger than the sum of its proper divisors (11906795).

55771405 is a wasteful number, since it uses less digits than its factorization.

55771405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125423.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 55771405 is about 7468.0255087941. The cubic root of 55771405 is about 382.0649474286.

The spelling of 55771405 in words is "fifty-five million, seven hundred seventy-one thousand, four hundred five".