55781395 has 16 divisors (see below), whose sum is σ = 68302080. Its totient is φ = 43725024.

The previous prime is 55781381. The next prime is 55781399. The reversal of 55781395 is 59318755.

It is a cyclic number.

It is not a de Polignac number, because 55781395 - 2¹³ = 55773203 is a prime.

It is a super-2 number, since 2×55781395² = 6223128056292050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55781399) 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, 57202 + ... + 58168.

It is an arithmetic number, because the mean of its divisors is an integer number (4268880).

Almost surely, 2^55781395 is an apocalyptic number.

55781395 is a deficient number, since it is larger than the sum of its proper divisors (12520685).

55781395 is a wasteful number, since it uses less digits than its factorization.

55781395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194.

The product of its digits is 189000, while the sum is 43.

The square root of 55781395 is about 7468.6943303365. The cubic root of 55781395 is about 382.0877584070.

The spelling of 55781395 in words is "fifty-five million, seven hundred eighty-one thousand, three hundred ninety-five".