642054 has 16 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 183432.

The previous prime is 642049. The next prime is 642071. The reversal of 642054 is 450246.

642054 = T₂₀₀ + T₂₀₁ + ... + T₂₂₇.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 642054.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642054.

It is an unprimeable number.

642054 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7602 + ... + 7685.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2⁶⁴²⁰⁵⁴ is an apocalyptic number.

642054 is an abundant number, since it is smaller than the sum of its proper divisors (825594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642054 is a wasteful number, since it uses less digits than its factorization.

642054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15299.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 642054 is about 801.2827216407. The cubic root of 642054 is about 86.2694810018.

The spelling of 642054 in words is "six hundred forty-two thousand, fifty-four".