642270420 has 216 divisors, whose sum is σ = 2202068232. Its totient is φ = 151303680.

The previous prime is 642270407. The next prime is 642270427. The reversal of 642270420 is 24072246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 170772624 + 471497796 = 13068^2 + 21714^2 .

It is a super-2 number, since 2×642270420² = 825022584813952800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642270427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 805462 + ... + 806258.

Almost surely, 2^642270420 is an apocalyptic number.

642270420 is a gapful number since it is divisible by the number (60) 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 642270420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101034116).

642270420 is an abundant number, since it is smaller than the sum of its proper divisors (1559797812).

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

642270420 is a wasteful number, since it uses less digits than its factorization.

642270420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 642270420 is about 25343.0546698696. The cubic root of 642270420 is about 862.7917299223.

The spelling of 642270420 in words is "six hundred forty-two million, two hundred seventy thousand, four hundred twenty".