620985269 has 4 divisors (see below), whose sum is σ = 627133740. Its totient is φ = 614836800.

The previous prime is 620985247. The next prime is 620985289. The reversal of 620985269 is 962589026.

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 2 ways, for example, as 554367025 + 66618244 = 23545^2 + 8162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620985269 is a prime.

It is a super-2 number, since 2×620985269² = 771245408630004722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620985229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3074084 + ... + 3074285.

It is an arithmetic number, because the mean of its divisors is an integer number (156783435).

Almost surely, 2^620985269 is an apocalyptic number.

It is an amenable number.

620985269 is a deficient number, since it is larger than the sum of its proper divisors (6148471).

620985269 is a wasteful number, since it uses less digits than its factorization.

620985269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6148470.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 620985269 is about 24919.5760196678. The cubic root of 620985269 is about 853.1533478467.

The spelling of 620985269 in words is "six hundred twenty million, nine hundred eighty-five thousand, two hundred sixty-nine".