55787578 has 32 divisors (see below), whose sum is σ = 106473600. Its totient is φ = 21732480.

The previous prime is 55787551. The next prime is 55787579. The reversal of 55787578 is 87578755.

It is a super-2 number, since 2×55787578² = 6224507718212168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55787579) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3850 + ... + 11242.

It is an arithmetic number, because the mean of its divisors is an integer number (3327300).

Almost surely, 2^55787578 is an apocalyptic number.

55787578 is a deficient number, since it is larger than the sum of its proper divisors (50686022).

55787578 is a wasteful number, since it uses less digits than its factorization.

55787578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7427 (or 7413 counting only the distinct ones).

The product of its digits is 2744000, while the sum is 52.

The square root of 55787578 is about 7469.1082466383. The cubic root of 55787578 is about 382.1018751887.

It can be divided in two parts, 55787 and 578, that added together give a palindrome (56365).

The spelling of 55787578 in words is "fifty-five million, seven hundred eighty-seven thousand, five hundred seventy-eight".