820378861444 has 12 divisors (see below), whose sum is σ = 1452960152784. Its totient is φ = 405247389224.

The previous prime is 820378861399. The next prime is 820378861459. The reversal of 820378861444 is 444168873028.

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, 1235510002 + ... + 1235510665.

It is an arithmetic number, because the mean of its divisors is an integer number (121080012732).

Almost surely, 2^820378861444 is an apocalyptic number.

It is an amenable number.

820378861444 is a deficient number, since it is larger than the sum of its proper divisors (632581291340).

820378861444 is a wasteful number, since it uses less digits than its factorization.

820378861444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471020754 (or 2471020752 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 55.

The spelling of 820378861444 in words is "eight hundred twenty billion, three hundred seventy-eight million, eight hundred sixty-one thousand, four hundred forty-four".