55525780 has 12 divisors (see below), whose sum is σ = 116604180. Its totient is φ = 22210304.

The previous prime is 55525777. The next prime is 55525783. The reversal of 55525780 is 8752555.

It is an interprime number because it is at equal distance from previous prime (55525777) and next prime (55525783).

It can be written as a sum of positive squares in 2 ways, for example, as 28005264 + 27520516 = 5292^2 + 5246^2 .

It is a super-2 number, since 2×55525780² = 6166224489216800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55525783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388125 + ... + 1388164.

It is an arithmetic number, because the mean of its divisors is an integer number (9717015).

Almost surely, 2^55525780 is an apocalyptic number.

It is an amenable number.

55525780 is an abundant number, since it is smaller than the sum of its proper divisors (61078400).

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

55525780 is a wasteful number, since it uses less digits than its factorization.

55525780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776298 (or 2776296 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 37.

The square root of 55525780 is about 7451.5622523066. The cubic root of 55525780 is about 381.5032329971.

It can be divided in two parts, 555 and 25780, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 55525780 in words is "fifty-five million, five hundred twenty-five thousand, seven hundred eighty".