55709000 has 128 divisors (see below), whose sum is σ = 144050400. Its totient is φ = 20070400.

The previous prime is 55708993. The next prime is 55709009. The reversal of 55709000 is 90755.

It can be written as a sum of positive squares in 16 ways, for example, as 7628644 + 48080356 = 2762^2 + 6934^2 .

It is not an unprimeable number, because it can be changed into a prime (55709009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 492944 + ... + 493056.

Almost surely, 2^55709000 is an apocalyptic number.

55709000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55709000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72025200).

55709000 is an abundant number, since it is smaller than the sum of its proper divisors (88341400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55709000 is a wasteful number, since it uses less digits than its factorization.

55709000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 1575, while the sum is 26.

The square root of 55709000 is about 7463.8461934850. The cubic root of 55709000 is about 381.9223913315.

Adding to 55709000 its reverse (90755), we get a palindrome (55799755).

The spelling of 55709000 in words is "fifty-five million, seven hundred nine thousand".