642231420 has 24 divisors (see below), whose sum is σ = 1798248144. Its totient is φ = 171261696.

The previous prime is 642231409. The next prime is 642231431. The reversal of 642231420 is 24132246.

It is an interprime number because it is at equal distance from previous prime (642231409) and next prime (642231431).

It is a super-2 number, since 2×642231420² = 824922393670432800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5351869 + ... + 5351988.

It is an arithmetic number, because the mean of its divisors is an integer number (74927006).

Almost surely, 2^642231420 is an apocalyptic number.

642231420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642231420 is an abundant number, since it is smaller than the sum of its proper divisors (1156016724).

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

642231420 is a wasteful number, since it uses less digits than its factorization.

642231420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703869 (or 10703867 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 642231420 is about 25342.2852166098. The cubic root of 642231420 is about 862.7742660641.

Adding to 642231420 its reverse (24132246), we get a palindrome (666363666).

The spelling of 642231420 in words is "six hundred forty-two million, two hundred thirty-one thousand, four hundred twenty".