1087628391 has 12 divisors (see below), whose sum is σ = 1629205032. Its totient is φ = 725085432.

The previous prime is 1087628309. The next prime is 1087628411. The reversal of 1087628391 is 1938267801.

1087628391 is a `hidden beast` number, since 10 + 8 + 7 + 628 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 1087628391 - 2⁷ = 1087628263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087628291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2237676 + ... + 2238161.

It is an arithmetic number, because the mean of its divisors is an integer number (135767086).

Almost surely, 2^1087628391 is an apocalyptic number.

1087628391 is a deficient number, since it is larger than the sum of its proper divisors (541576641).

1087628391 is an frugal number, since it uses more digits than its factorization.

1087628391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475852 (or 4475840 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1087628391 is about 32979.2114975480. The cubic root of 1087628391 is about 1028.3955259463.

The spelling of 1087628391 in words is "one billion, eighty-seven million, six hundred twenty-eight thousand, three hundred ninety-one".