55781374 has 16 divisors (see below), whose sum is σ = 91434096. Its totient is φ = 25312000.

The previous prime is 55781357. The next prime is 55781377. The reversal of 55781374 is 47318755.

It is a super-2 number, since 2×55781374² = 6223123370655752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55781377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13614 + ... + 17230.

It is an arithmetic number, because the mean of its divisors is an integer number (5714631).

Almost surely, 2^55781374 is an apocalyptic number.

55781374 is a deficient number, since it is larger than the sum of its proper divisors (35652722).

55781374 is a wasteful number, since it uses less digits than its factorization.

55781374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its digits is 117600, while the sum is 40.

The square root of 55781374 is about 7468.6929244681. The cubic root of 55781374 is about 382.0877104589.

The spelling of 55781374 in words is "fifty-five million, seven hundred eighty-one thousand, three hundred seventy-four".