1078691616 has 144 divisors (see below), whose sum is σ = 3310050744. Its totient is φ = 331948032.

The previous prime is 1078691567. The next prime is 1078691623. The reversal of 1078691616 is 6161968701.

It can be written as a sum of positive squares in 4 ways, for example, as 1053651600 + 25040016 = 32460^2 + 5004^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257410 + ... + 261566.

Almost surely, 2^1078691616 is an apocalyptic number.

1078691616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1078691616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655025372).

1078691616 is an abundant number, since it is smaller than the sum of its proper divisors (2231359128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1078691616 is a wasteful number, since it uses less digits than its factorization.

1078691616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1078691616 is about 32843.4409890316. The cubic root of 1078691616 is about 1025.5710848114.

The spelling of 1078691616 in words is "one billion, seventy-eight million, six hundred ninety-one thousand, six hundred sixteen".