620689015 has 4 divisors (see below), whose sum is σ = 744826824. Its totient is φ = 496551208.

The previous prime is 620688967. The next prime is 620689019. The reversal of 620689015 is 510986026.

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

It is a cyclic number.

It is not a de Polignac number, because 620689015 - 2⁹ = 620688503 is a prime.

It is a super-3 number, since 3×620689015³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620689019) 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, 62068897 + ... + 62068906.

It is an arithmetic number, because the mean of its divisors is an integer number (186206706).

Almost surely, 2^620689015 is an apocalyptic number.

620689015 is a deficient number, since it is larger than the sum of its proper divisors (124137809).

620689015 is a wasteful number, since it uses less digits than its factorization.

620689015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124137808.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 620689015 is about 24913.6311082909. The cubic root of 620689015 is about 853.0176547213.

The spelling of 620689015 in words is "six hundred twenty million, six hundred eighty-nine thousand, fifteen".