55807206 has 64 divisors (see below), whose sum is σ = 140625408. Its totient is φ = 14370048.

The previous prime is 55807201. The next prime is 55807231. The reversal of 55807206 is 60270855.

It is a happy number.

It is a super-2 number, since 2×55807206² = 6228888483052872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807201) 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, 22290 + ... + 24666.

It is an arithmetic number, because the mean of its divisors is an integer number (2197272).

Almost surely, 2^55807206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55807206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70312704).

55807206 is an abundant number, since it is smaller than the sum of its proper divisors (84818202).

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

55807206 is a wasteful number, since it uses less digits than its factorization.

55807206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 55807206 is about 7470.4220764291. The cubic root of 55807206 is about 382.1466821540.

The spelling of 55807206 in words is "fifty-five million, eight hundred seven thousand, two hundred six".