770661378 has 24 divisors (see below), whose sum is σ = 1731610608. Its totient is φ = 256886964.

The previous prime is 770661377. The next prime is 770661389. The reversal of 770661378 is 873166077.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (770661371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 792376 + ... + 793347.

It is an arithmetic number, because the mean of its divisors is an integer number (72150442).

Almost surely, 2^770661378 is an apocalyptic number.

770661378 is an abundant number, since it is smaller than the sum of its proper divisors (960949230).

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

770661378 is a wasteful number, since it uses less digits than its factorization.

770661378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585740 (or 1585728 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 770661378 is about 27760.7884974473. The cubic root of 770661378 is about 916.8279929982.

The spelling of 770661378 in words is "seven hundred seventy million, six hundred sixty-one thousand, three hundred seventy-eight".