620417985 has 32 divisors (see below), whose sum is σ = 1130001408. Its totient is φ = 287728320.

The previous prime is 620417983. The next prime is 620418037. The reversal of 620417985 is 589714026.

It is not a de Polignac number, because 620417985 - 2¹ = 620417983 is a prime.

It is a super-2 number, since 2×620417985² = 769836952222920450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (620417983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77947 + ... + 85536.

It is an arithmetic number, because the mean of its divisors is an integer number (35312544).

Almost surely, 2^620417985 is an apocalyptic number.

It is an amenable number.

620417985 is a deficient number, since it is larger than the sum of its proper divisors (509583423).

620417985 is a wasteful number, since it uses less digits than its factorization.

620417985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163525.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 620417985 is about 24908.1911226006. The cubic root of 620417985 is about 852.8934771120.

The spelling of 620417985 in words is "six hundred twenty million, four hundred seventeen thousand, nine hundred eighty-five".