771077988 has 72 divisors (see below), whose sum is σ = 2107744800. Its totient is φ = 243101088.

The previous prime is 771077977. The next prime is 771078001. The reversal of 771077988 is 889770177.

It is a super-2 number, since 2×771077988² = 1189122527156256288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1257570 + ... + 1258182.

Almost surely, 2^771077988 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 771077988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053872400).

771077988 is an abundant number, since it is smaller than the sum of its proper divisors (1336666812).

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

771077988 is a wasteful number, since it uses less digits than its factorization.

771077988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 54.

The square root of 771077988 is about 27768.2910529258. The cubic root of 771077988 is about 916.9931718581.

The spelling of 771077988 in words is "seven hundred seventy-one million, seventy-seven thousand, nine hundred eighty-eight".