55784980 has 24 divisors (see below), whose sum is σ = 121189320. Its totient is φ = 21544320.

The previous prime is 55784977. The next prime is 55784983. The reversal of 55784980 is 8948755.

It is an interprime number because it is at equal distance from previous prime (55784977) and next prime (55784983).

It can be written as a sum of positive squares in 4 ways, for example, as 23020804 + 32764176 = 4798^2 + 5724^2 .

It is a super-2 number, since 2×55784980² = 6223927987200800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55784980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55784983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47511 + ... + 48670.

It is an arithmetic number, because the mean of its divisors is an integer number (5049555).

Almost surely, 2^55784980 is an apocalyptic number.

It is an amenable number.

55784980 is an abundant number, since it is smaller than the sum of its proper divisors (65404340).

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

55784980 is a wasteful number, since it uses less digits than its factorization.

55784980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96219 (or 96217 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 55784980 is about 7468.9343282693. The cubic root of 55784980 is about 382.0959436647.

The spelling of 55784980 in words is "fifty-five million, seven hundred eighty-four thousand, nine hundred eighty".