642774 has 16 divisors (see below), whose sum is σ = 1402560. Its totient is φ = 194760.

The previous prime is 642769. The next prime is 642779. The reversal of 642774 is 477246.

It is an interprime number because it is at equal distance from previous prime (642769) and next prime (642779).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642779) by changing a digit.

642774 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, 4804 + ... + 4935.

It is an arithmetic number, because the mean of its divisors is an integer number (87660).

2⁶⁴²⁷⁷⁴ is an apocalyptic number.

642774 is an abundant number, since it is smaller than the sum of its proper divisors (759786).

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

642774 is a wasteful number, since it uses less digits than its factorization.

642774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9755.

The product of its digits is 9408, while the sum is 30.

The square root of 642774 is about 801.7318753798. The cubic root of 642774 is about 86.3017165160.

The spelling of 642774 in words is "six hundred forty-two thousand, seven hundred seventy-four".