770656381 has 12 divisors (see below), whose sum is σ = 850180156. Its totient is φ = 698037120.

The previous prime is 770656349. The next prime is 770656399. The reversal of 770656381 is 183656077.

It can be written as a sum of positive squares in 2 ways, for example, as 381225625 + 389430756 = 19525^2 + 19734^2 .

It is not a de Polignac number, because 770656381 - 2⁵ = 770656349 is a prime.

It is a super-2 number, since 2×770656381² = 1187822515152034322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (770656301) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 22021 + ... + 45013.

Almost surely, 2^770656381 is an apocalyptic number.

It is an amenable number.

770656381 is a deficient number, since it is larger than the sum of its proper divisors (79523775).

770656381 is a wasteful number, since it uses less digits than its factorization.

770656381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23292 (or 23281 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 770656381 is about 27760.6984962555. The cubic root of 770656381 is about 916.8260114105.

The spelling of 770656381 in words is "seven hundred seventy million, six hundred fifty-six thousand, three hundred eighty-one".