1087557779 has 32 divisors (see below), whose sum is σ = 1482043392. Its totient is φ = 771840000.

The previous prime is 1087557749. The next prime is 1087557791. The reversal of 1087557779 is 9777557801.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1087557779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087557749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27179 + ... + 53979.

It is an arithmetic number, because the mean of its divisors is an integer number (46313856).

Almost surely, 2^1087557779 is an apocalyptic number.

1087557779 is a deficient number, since it is larger than the sum of its proper divisors (394485613).

1087557779 is a wasteful number, since it uses less digits than its factorization.

1087557779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26867.

The product of its (nonzero) digits is 4321800, while the sum is 56.

The square root of 1087557779 is about 32978.1409269837. The cubic root of 1087557779 is about 1028.3732699879.

The spelling of 1087557779 in words is "one billion, eighty-seven million, five hundred fifty-seven thousand, seven hundred seventy-nine".