1081620856 has 8 divisors (see below), whose sum is σ = 2028039120. Its totient is φ = 540810424.

The previous prime is 1081620851. The next prime is 1081620871. The reversal of 1081620856 is 6580261801.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1081620856² = 2339807352268345472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081620851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67601296 + ... + 67601311.

It is an arithmetic number, because the mean of its divisors is an integer number (253504890).

Almost surely, 2^1081620856 is an apocalyptic number.

It is an amenable number.

1081620856 is a deficient number, since it is larger than the sum of its proper divisors (946418264).

1081620856 is a wasteful number, since it uses less digits than its factorization.

1081620856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135202613 (or 135202609 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1081620856 is about 32888.0047433711. The cubic root of 1081620856 is about 1026.4985752992.

The spelling of 1081620856 in words is "one billion, eighty-one million, six hundred twenty thousand, eight hundred fifty-six".