55729778 has 12 divisors (see below), whose sum is σ = 90520218. Its totient is φ = 25721280.

The previous prime is 55729771. The next prime is 55729801. The reversal of 55729778 is 87792755.

It can be written as a sum of positive squares in 3 ways, for example, as 12866569 + 42863209 = 3587^2 + 6547^2 .

It is not an unprimeable number, because it can be changed into a prime (55729771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82103 + ... + 82778.

Almost surely, 2^55729778 is an apocalyptic number.

55729778 is a deficient number, since it is larger than the sum of its proper divisors (34790440).

55729778 is a wasteful number, since it uses less digits than its factorization.

55729778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164909 (or 164896 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 50.

The square root of 55729778 is about 7465.2379734339. The cubic root of 55729778 is about 381.9698677840.

The spelling of 55729778 in words is "fifty-five million, seven hundred twenty-nine thousand, seven hundred seventy-eight".