771720258 has 8 divisors (see below), whose sum is σ = 1543440528. Its totient is φ = 257240084.

The previous prime is 771720251. The next prime is 771720259. The reversal of 771720258 is 852027177.

It is a sphenic number, since it is the product of 3 distinct primes.

771720258 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (771720251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64310016 + ... + 64310027.

It is an arithmetic number, because the mean of its divisors is an integer number (192930066).

Almost surely, 2^771720258 is an apocalyptic number.

771720258 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

771720258 is a wasteful number, since it uses less digits than its factorization.

771720258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128620048.

The product of its (nonzero) digits is 54880, while the sum is 39.

The square root of 771720258 is about 27779.8534553370. The cubic root of 771720258 is about 917.2477045881.

The spelling of 771720258 in words is "seven hundred seventy-one million, seven hundred twenty thousand, two hundred fifty-eight".