620706778 has 12 divisors (see below), whose sum is σ = 964275390. Its totient is φ = 299650736.

The previous prime is 620706767. The next prime is 620706803. The reversal of 620706778 is 877607026.

It can be written as a sum of positive squares in 3 ways, for example, as 568679409 + 52027369 = 23847^2 + 7213^2 .

It is the 72-nd Perrin number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182833 + ... + 186196.

Almost surely, 2^620706778 is an apocalyptic number.

620706778 is a deficient number, since it is larger than the sum of its proper divisors (343568612).

620706778 is a wasteful number, since it uses less digits than its factorization.

620706778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369089 (or 369060 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 620706778 is about 24913.9875973317. The cubic root of 620706778 is about 853.0257919192.

The spelling of 620706778 in words is "six hundred twenty million, seven hundred six thousand, seven hundred seventy-eight".