1087778 has 4 divisors (see below), whose sum is σ = 1631670. Its totient is φ = 543888.

The previous prime is 1087753. The next prime is 1087781. The reversal of 1087778 is 8777801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8777801 = 71 ⋅123631.

It can be written as a sum of positive squares in only one way, i.e., 896809 + 190969 = 947^2 + 437^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271943 + ... + 271946.

2^1087778 is an apocalyptic number.

1087778 is a deficient number, since it is larger than the sum of its proper divisors (543892).

1087778 is an equidigital number, since it uses as much as digits as its factorization.

1087778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543891.

The product of its (nonzero) digits is 21952, while the sum is 38.

The square root of 1087778 is about 1042.9659630113. The cubic root of 1087778 is about 102.8442677520.

The spelling of 1087778 in words is "one million, eighty-seven thousand, seven hundred seventy-eight".