55820978782 has 8 divisors (see below), whose sum is σ = 84390771456. Its totient is φ = 27690721632.

The previous prime is 55820978761. The next prime is 55820978791. The reversal of 55820978782 is 28787902855.

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

It is a self number, because there is not a number n which added to its sum of digits gives 55820978782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109883563 + ... + 109884070.

It is an arithmetic number, because the mean of its divisors is an integer number (10548846432).

Almost surely, 2^55820978782 is an apocalyptic number.

55820978782 is a deficient number, since it is larger than the sum of its proper divisors (28569792674).

55820978782 is a wasteful number, since it uses less digits than its factorization.

55820978782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219767762.

The product of its (nonzero) digits is 22579200, while the sum is 61.

The spelling of 55820978782 in words is "fifty-five billion, eight hundred twenty million, nine hundred seventy-eight thousand, seven hundred eighty-two".