1087781978 has 8 divisors (see below), whose sum is σ = 1632022560. Its totient is φ = 543774460.

The previous prime is 1087781969. The next prime is 1087781993. The reversal of 1087781978 is 8791877801.

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

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, 46088 + ... + 65571.

It is an arithmetic number, because the mean of its divisors is an integer number (204002820).

Almost surely, 2^1087781978 is an apocalyptic number.

1087781978 is a deficient number, since it is larger than the sum of its proper divisors (544240582).

1087781978 is a wasteful number, since it uses less digits than its factorization.

1087781978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116532.

The product of its (nonzero) digits is 1580544, while the sum is 56.

The square root of 1087781978 is about 32981.5399579826. The cubic root of 1087781978 is about 1028.4439311892.

The spelling of 1087781978 in words is "one billion, eighty-seven million, seven hundred eighty-one thousand, nine hundred seventy-eight".