63215620 has 24 divisors (see below), whose sum is σ = 142965144. Its totient is φ = 23341056.

The previous prime is 63215617. The next prime is 63215627. The reversal of 63215620 is 2651236.

63215620 = 954² + 955² + ... + 1018².

It can be written as a sum of positive squares in 4 ways, for example, as 2125764 + 61089856 = 1458^2 + 7816^2 .

It is a super-2 number, since 2×63215620² = 7992429223968800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63215627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121309 + ... + 121828.

It is an arithmetic number, because the mean of its divisors is an integer number (5956881).

Almost surely, 2^63215620 is an apocalyptic number.

It is an amenable number.

63215620 is an abundant number, since it is smaller than the sum of its proper divisors (79749524).

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

63215620 is a wasteful number, since it uses less digits than its factorization.

63215620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243159 (or 243157 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 63215620 is about 7950.8251144142. The cubic root of 63215620 is about 398.3591532586.

Adding to 63215620 its reverse (2651236), we get a palindrome (65866856).

The spelling of 63215620 in words is "sixty-three million, two hundred fifteen thousand, six hundred twenty".