55780040 has 16 divisors (see below), whose sum is σ = 125505180. Its totient is φ = 22312000.

The previous prime is 55780033. The next prime is 55780057. The reversal of 55780040 is 4008755.

It can be written as a sum of positive squares in 2 ways, for example, as 55681444 + 98596 = 7462^2 + 314^2 .

It is a super-2 number, since 2×55780040² = 6222825724803200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55779985 and 55780012.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 697211 + ... + 697290.

Almost surely, 2^55780040 is an apocalyptic number.

It is an amenable number.

55780040 is an abundant number, since it is smaller than the sum of its proper divisors (69725140).

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

55780040 is a wasteful number, since it uses less digits than its factorization.

55780040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394512 (or 1394508 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 55780040 is about 7468.6036178124. The cubic root of 55780040 is about 382.0846645851.

Adding to 55780040 its reverse (4008755), we get a palindrome (59788795).

The spelling of 55780040 in words is "fifty-five million, seven hundred eighty thousand, forty".