771827028 has 72 divisors (see below), whose sum is σ = 2105226144. Its totient is φ = 219441600.

The previous prime is 771827011. The next prime is 771827033. The reversal of 771827028 is 820728177.

It is a super-2 number, since 2×771827028² = 1191433922302625568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120958 + ... + 127178.

It is an arithmetic number, because the mean of its divisors is an integer number (29239252).

Almost surely, 2^771827028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 771827028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1052613072).

771827028 is an abundant number, since it is smaller than the sum of its proper divisors (1333399116).

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

771827028 is a wasteful number, since it uses less digits than its factorization.

771827028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6453 (or 6444 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 771827028 is about 27781.7751052736. The cubic root of 771827028 is about 917.2900040354.

The spelling of 771827028 in words is "seven hundred seventy-one million, eight hundred twenty-seven thousand, twenty-eight".