620856890 has 8 divisors (see below), whose sum is σ = 1117542420. Its totient is φ = 248342752.

The previous prime is 620856883. The next prime is 620856923. The reversal of 620856890 is 98658026.

It is a happy number.

It is a Cunningham number, because it is equal to 24917²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 620856889 + 1 = 24917^2 + 1^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31042835 + ... + 31042854.

Almost surely, 2^620856890 is an apocalyptic number.

620856890 is a deficient number, since it is larger than the sum of its proper divisors (496685530).

620856890 is a wasteful number, since it uses less digits than its factorization.

620856890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62085696.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 620856890 is about 24917.0000200666. Note that the first 4 decimals coincide. The cubic root of 620856890 is about 853.0945517540.

The spelling of 620856890 in words is "six hundred twenty million, eight hundred fifty-six thousand, eight hundred ninety".