55784477390 has 16 divisors (see below), whose sum is σ = 100414784160. Its totient is φ = 22313185440.

The previous prime is 55784477383. The next prime is 55784477407. The reversal of 55784477390 is 9377448755.

It is a happy number.

It is a super-2 number, since 2×55784477390² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590231 + ... + 678189.

It is an arithmetic number, because the mean of its divisors is an integer number (6275924010).

Almost surely, 2^55784477390 is an apocalyptic number.

55784477390 is a deficient number, since it is larger than the sum of its proper divisors (44630306770).

55784477390 is a wasteful number, since it uses less digits than its factorization.

55784477390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151387.

The product of its (nonzero) digits is 29635200, while the sum is 59.

The spelling of 55784477390 in words is "fifty-five billion, seven hundred eighty-four million, four hundred seventy-seven thousand, three hundred ninety".