787581361 has 12 divisors (see below), whose sum is σ = 917090100. Its totient is φ = 674388960.

The previous prime is 787581349. The next prime is 787581401. The reversal of 787581361 is 163185787.

It can be written as a sum of positive squares in 2 ways, for example, as 536200336 + 251381025 = 23156^2 + 15855^2 .

It is not a de Polignac number, because 787581361 - 2⁷ = 787581233 is a prime.

It is a super-2 number, since 2×787581361² = 1240568800389224642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787582361) 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, 44415 + ... + 59563.

It is an arithmetic number, because the mean of its divisors is an integer number (76424175).

Almost surely, 2^787581361 is an apocalyptic number.

It is an amenable number.

787581361 is a deficient number, since it is larger than the sum of its proper divisors (129508739).

787581361 is a wasteful number, since it uses less digits than its factorization.

787581361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16224 (or 16217 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 787581361 is about 28063.8800061574. The cubic root of 787581361 is about 923.4891766327.

The spelling of 787581361 in words is "seven hundred eighty-seven million, five hundred eighty-one thousand, three hundred sixty-one".