55651398 has 64 divisors (see below), whose sum is σ = 128991744. Its totient is φ = 15840000.

The previous prime is 55651397. The next prime is 55651423. The reversal of 55651398 is 89315655.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55651397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92298 + ... + 92898.

It is an arithmetic number, because the mean of its divisors is an integer number (2015496).

Almost surely, 2^55651398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55651398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64495872).

55651398 is an abundant number, since it is smaller than the sum of its proper divisors (73340346).

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

55651398 is a wasteful number, since it uses less digits than its factorization.

55651398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 162000, while the sum is 42.

The square root of 55651398 is about 7459.9864611137. The cubic root of 55651398 is about 381.7907125466.

The spelling of 55651398 in words is "fifty-five million, six hundred fifty-one thousand, three hundred ninety-eight".