55507800 has 96 divisors (see below), whose sum is σ = 174631680. Its totient is φ = 14582400.

The previous prime is 55507789. The next prime is 55507811. The reversal of 55507800 is 870555.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55507789) and next prime (55507811).

It is a super-2 number, since 2×55507800² = 6162231721680000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41949 + ... + 43251.

It is an arithmetic number, because the mean of its divisors is an integer number (1819080).

Almost surely, 2^55507800 is an apocalyptic number.

55507800 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 55507800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87315840).

55507800 is an abundant number, since it is smaller than the sum of its proper divisors (119123880).

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

55507800 is a wasteful number, since it uses less digits than its factorization.

55507800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 55507800 is about 7450.3556962067. The cubic root of 55507800 is about 381.4620499127.

The spelling of 55507800 in words is "fifty-five million, five hundred seven thousand, eight hundred".