620615 has 4 divisors (see below), whose sum is σ = 744744. Its totient is φ = 496488.

The previous prime is 620603. The next prime is 620623. The reversal of 620615 is 516026.

620615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 620615 - 2⁸ = 620359 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62057 + ... + 62066.

It is an arithmetic number, because the mean of its divisors is an integer number (186186).

2⁶²⁰⁶¹⁵ is an apocalyptic number.

620615 is a deficient number, since it is larger than the sum of its proper divisors (124129).

620615 is a wasteful number, since it uses less digits than its factorization.

620615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124128.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 620615 is about 787.7912159957. The cubic root of 620615 is about 85.2983746914.

The spelling of 620615 in words is "six hundred twenty thousand, six hundred fifteen".