55390100 has 18 divisors (see below), whose sum is σ = 120196734. Its totient is φ = 22156000.

The previous prime is 55390091. The next prime is 55390103. The reversal of 55390100 is 109355.

It can be written as a sum of positive squares in 3 ways, for example, as 4866436 + 50523664 = 2206^2 + 7108^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55390103) 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, 276851 + ... + 277050.

Almost surely, 2^55390100 is an apocalyptic number.

55390100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55390100 is an abundant number, since it is smaller than the sum of its proper divisors (64806634).

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

55390100 is a wasteful number, since it uses less digits than its factorization.

55390100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553915 (or 553908 counting only the distinct ones).

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 55390100 is about 7442.4525527544. The cubic root of 55390100 is about 381.1922388531.

Adding to 55390100 its reverse (109355), we get a palindrome (55499455).

The spelling of 55390100 in words is "fifty-five million, three hundred ninety thousand, one hundred".