55778487 has 8 divisors (see below), whose sum is σ = 74801904. Its totient is φ = 36970368.

The previous prime is 55778467. The next prime is 55778521. The reversal of 55778487 is 78487755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55778487 - 2⁸ = 55778231 is a prime.

It is a super-2 number, since 2×55778487² = 6222479224018338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778417) 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, 53218 + ... + 54255.

It is an arithmetic number, because the mean of its divisors is an integer number (9350238).

Almost surely, 2^55778487 is an apocalyptic number.

55778487 is a deficient number, since it is larger than the sum of its proper divisors (19023417).

55778487 is a wasteful number, since it uses less digits than its factorization.

55778487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107649.

The product of its digits is 2195200, while the sum is 51.

The square root of 55778487 is about 7468.4996485238. The cubic root of 55778487 is about 382.0811186155.

It can be divided in two parts, 55778 and 487, that added together give a palindrome (56265).

The spelling of 55778487 in words is "fifty-five million, seven hundred seventy-eight thousand, four hundred eighty-seven".