775533690 has 160 divisors (see below), whose sum is σ = 2170072080. Its totient is φ = 198567936.

The previous prime is 775533679. The next prime is 775533691. The reversal of 775533690 is 96335577.

775533690 is a `hidden beast` number, since 7 + 7 + 553 + 3 + 6 + 90 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 457660449 + 317873241 = 21393^2 + 17829^2 .

It is a super-2 number, since 2×775533690² = 1202905008650032200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (775533691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3386496 + ... + 3386724.

Almost surely, 2^775533690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775533690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085036040).

775533690 is an abundant number, since it is smaller than the sum of its proper divisors (1394538390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775533690 is a wasteful number, since it uses less digits than its factorization.

775533690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 595350, while the sum is 45.

The square root of 775533690 is about 27848.4055198857. The cubic root of 775533690 is about 918.7560732626.

The spelling of 775533690 in words is "seven hundred seventy-five million, five hundred thirty-three thousand, six hundred ninety".