620780668 has 6 divisors (see below), whose sum is σ = 1086366176. Its totient is φ = 310390332.

The previous prime is 620780663. The next prime is 620780689. The reversal of 620780668 is 866087026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620780663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77597580 + ... + 77597587.

Almost surely, 2^620780668 is an apocalyptic number.

It is an amenable number.

620780668 is a deficient number, since it is larger than the sum of its proper divisors (465585508).

620780668 is a wasteful number, since it uses less digits than its factorization.

620780668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155195171 (or 155195169 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 620780668 is about 24915.4704551209. The cubic root of 620780668 is about 853.0596391275.

The spelling of 620780668 in words is "six hundred twenty million, seven hundred eighty thousand, six hundred sixty-eight".