620669578 has 4 divisors (see below), whose sum is σ = 931004370. Its totient is φ = 310334788.

The previous prime is 620669573. The next prime is 620669641. The reversal of 620669578 is 875966026.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 432348849 + 188320729 = 20793^2 + 13723^2 .

It is not an unprimeable number, because it can be changed into a prime (620669573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155167393 + ... + 155167396.

Almost surely, 2^620669578 is an apocalyptic number.

620669578 is a deficient number, since it is larger than the sum of its proper divisors (310334792).

620669578 is a wasteful number, since it uses less digits than its factorization.

620669578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310334791.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 620669578 is about 24913.2410175794. The cubic root of 620669578 is about 853.0087504892.

The spelling of 620669578 in words is "six hundred twenty million, six hundred sixty-nine thousand, five hundred seventy-eight".