771813994 has 12 divisors (see below), whose sum is σ = 1346736834. Its totient is φ = 330777384.

The previous prime is 771813983. The next prime is 771814007. The reversal of 771813994 is 499318177.

It can be written as a sum of positive squares in only one way, i.e., 520432969 + 251381025 = 22813^2 + 15855^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3937729 + ... + 3937924.

Almost surely, 2^771813994 is an apocalyptic number.

771813994 is a deficient number, since it is larger than the sum of its proper divisors (574922840).

771813994 is a wasteful number, since it uses less digits than its factorization.

771813994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875669 (or 7875662 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 771813994 is about 27781.5405260399. The cubic root of 771813994 is about 917.2848405188.

It can be divided in two parts, 7718 and 13994, that added together give a palindrome (21712).

The spelling of 771813994 in words is "seven hundred seventy-one million, eight hundred thirteen thousand, nine hundred ninety-four".