770521649 has 6 divisors (see below), whose sum is σ = 813210210. Its totient is φ = 729967536.

The previous prime is 770521621. The next prime is 770521699. The reversal of 770521649 is 946125077.

It can be written as a sum of positive squares in only one way, i.e., 769507600 + 1014049 = 27740^2 + 1007^2 .

It is a de Polignac number, because none of the positive numbers 2^k-770521649 is a prime.

It is a super-2 number, since 2×770521649² = 1187407223155358402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (770521699) 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 5 ways as a sum of consecutive naturals, for example, 1066844 + ... + 1067565.

It is an arithmetic number, because the mean of its divisors is an integer number (135535035).

Almost surely, 2^770521649 is an apocalyptic number.

It is an amenable number.

770521649 is a deficient number, since it is larger than the sum of its proper divisors (42688561).

770521649 is a wasteful number, since it uses less digits than its factorization.

770521649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134447 (or 2134428 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 770521649 is about 27758.2717221372. The cubic root of 770521649 is about 916.7725794684.

The spelling of 770521649 in words is "seven hundred seventy million, five hundred twenty-one thousand, six hundred forty-nine".