55729957 has 4 divisors (see below), whose sum is σ = 55748620. Its totient is φ = 55711296.

The previous prime is 55729939. The next prime is 55729969. The reversal of 55729957 is 75992755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40119556 + 15610401 = 6334^2 + 3951^2 .

It is a 3-Lehmer number, since φ(55729957) divides (55729957-1)³.

It is a cyclic number.

It is not a de Polignac number, because 55729957 - 2¹⁹ = 55205669 is a prime.

It is a deceptive number, since it divides R_55729956.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55729957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55729937) 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, 3732 + ... + 11197.

It is an arithmetic number, because the mean of its divisors is an integer number (13937155).

It is a Poulet number, since it divides 2^55729956-1.

Almost surely, 2^55729957 is an apocalyptic number.

55729957 is the 3733-rd decagonal number.

It is an amenable number.

55729957 is a deficient number, since it is larger than the sum of its proper divisors (18663).

55729957 is a wasteful number, since it uses less digits than its factorization.

55729957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18662.

The product of its digits is 992250, while the sum is 49.

The square root of 55729957 is about 7465.2499623254. The cubic root of 55729957 is about 381.9702767367.

The spelling of 55729957 in words is "fifty-five million, seven hundred twenty-nine thousand, nine hundred fifty-seven".