770671921 has 4 divisors (see below), whose sum is σ = 772880500. Its totient is φ = 768463344.

The previous prime is 770671919. The next prime is 770671933. The reversal of 770671921 is 129176077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129176077 = 457 ⋅282661.

It can be written as a sum of positive squares in 2 ways, for example, as 609102400 + 161569521 = 24680^2 + 12711^2 .

It is a cyclic number.

It is not a de Polignac number, because 770671921 - 2¹ = 770671919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (770672921) 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 3 ways as a sum of consecutive naturals, for example, 1103766 + ... + 1104463.

It is an arithmetic number, because the mean of its divisors is an integer number (193220125).

Almost surely, 2^770671921 is an apocalyptic number.

It is an amenable number.

770671921 is a deficient number, since it is larger than the sum of its proper divisors (2208579).

770671921 is a wasteful number, since it uses less digits than its factorization.

770671921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208578.

The product of its (nonzero) digits is 37044, while the sum is 40.

The square root of 770671921 is about 27760.9783869373. The cubic root of 770671921 is about 916.8321738545.

The spelling of 770671921 in words is "seven hundred seventy million, six hundred seventy-one thousand, nine hundred twenty-one".