640054 has 4 divisors (see below), whose sum is σ = 960084. Its totient is φ = 320026.

The previous prime is 640049. The next prime is 640061. The reversal of 640054 is 450046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 450046 = 2 ⋅225023.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160012 + ... + 160015.

It is an arithmetic number, because the mean of its divisors is an integer number (240021).

2⁶⁴⁰⁰⁵⁴ is an apocalyptic number.

640054 is a deficient number, since it is larger than the sum of its proper divisors (320030).

640054 is a wasteful number, since it uses less digits than its factorization.

640054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320029.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 640054 is about 800.0337492881. The cubic root of 640054 is about 86.1798112721.

It can be divided in two parts, 64005 and 4, that added together give a square (64009 = 253²).

The spelling of 640054 in words is "six hundred forty thousand, fifty-four".