621875 has 12 divisors (see below), whose sum is σ = 781200. Its totient is φ = 495000.

The previous prime is 621871. The next prime is 621883. The reversal of 621875 is 578126.

It is not a de Polignac number, because 621875 - 2² = 621871 is a prime.

Its product of digits (3360) is a multiple of the sum of its prime factors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3026 + ... + 3224.

It is an arithmetic number, because the mean of its divisors is an integer number (65100).

621875 is a Friedman number, since it can be written as 5^7*(8-(6-1)^(-2)), using all its digits and the basic arithmetic operations.

2⁶²¹⁸⁷⁵ is an apocalyptic number.

621875 is a deficient number, since it is larger than the sum of its proper divisors (159325).

621875 is an frugal number, since it uses more digits than its factorization.

621875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 204 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 621875 is about 788.5905147794. The cubic root of 621875 is about 85.3560611797.

The spelling of 621875 in words is "six hundred twenty-one thousand, eight hundred seventy-five".