420621253760 has 32 divisors (see below), whose sum is σ = 1005547686300. Its totient is φ = 168248501248.

The previous prime is 420621253757. The next prime is 420621253817. The reversal of 420621253760 is 67352126024.

It can be written as a sum of positive squares in 2 ways, for example, as 392908326976 + 27712926784 = 626824^2 + 166472^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×420621253760² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328609715 + ... + 328610994.

Almost surely, 2^420621253760 is an apocalyptic number.

420621253760 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420621253760 is an abundant number, since it is smaller than the sum of its proper divisors (584926432540).

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

420621253760 is an equidigital number, since it uses as much as digits as its factorization.

420621253760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657220728 (or 657220716 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

Adding to 420621253760 its reverse (67352126024), we get a palindrome (487973379784).

The spelling of 420621253760 in words is "four hundred twenty billion, six hundred twenty-one million, two hundred fifty-three thousand, seven hundred sixty".