642455424 has 96 divisors (see below), whose sum is σ = 1990989000. Its totient is φ = 197673984.

The previous prime is 642455423. The next prime is 642455447. The reversal of 642455424 is 424554246.

642455424 is a `hidden beast` number, since 64 + 24 + 554 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642455423) 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, 6474 + ... + 36425.

Almost surely, 2^642455424 is an apocalyptic number.

642455424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642455424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995494500).

642455424 is an abundant number, since it is smaller than the sum of its proper divisors (1348533576).

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

642455424 is a wasteful number, since it uses less digits than its factorization.

642455424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42932 (or 42917 counting only the distinct ones).

The product of its digits is 153600, while the sum is 36.

The square root of 642455424 is about 25346.7044011643. The cubic root of 642455424 is about 862.8745634623.

The spelling of 642455424 in words is "six hundred forty-two million, four hundred fifty-five thousand, four hundred twenty-four".