771981612 has 12 divisors (see below), whose sum is σ = 1801290456. Its totient is φ = 257327200.

The previous prime is 771981599. The next prime is 771981641. The reversal of 771981612 is 216189177.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×771981612² = 1191911218532237088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32165889 + ... + 32165912.

It is an arithmetic number, because the mean of its divisors is an integer number (150107538).

Almost surely, 2^771981612 is an apocalyptic number.

It is an amenable number.

771981612 is an abundant number, since it is smaller than the sum of its proper divisors (1029308844).

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

771981612 is a wasteful number, since it uses less digits than its factorization.

771981612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64331808 (or 64331806 counting only the distinct ones).

The product of its digits is 42336, while the sum is 42.

The square root of 771981612 is about 27784.5570776286. The cubic root of 771981612 is about 917.3512392118.

The spelling of 771981612 in words is "seven hundred seventy-one million, nine hundred eighty-one thousand, six hundred twelve".