621422440 has 32 divisors (see below), whose sum is σ = 1446417000. Its totient is φ = 239997184.

The previous prime is 621422429. The next prime is 621422447. The reversal of 621422440 is 44224126.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 610781796 + 10640644 = 24714^2 + 3262^2 .

It is not an unprimeable number, because it can be changed into a prime (621422447) 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, 266695 + ... + 269014.

Almost surely, 2^621422440 is an apocalyptic number.

It is an amenable number.

621422440 is an abundant number, since it is smaller than the sum of its proper divisors (824994560).

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

621422440 is a wasteful number, since it uses less digits than its factorization.

621422440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535749 (or 535745 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 621422440 is about 24928.3461144136. The cubic root of 621422440 is about 853.3535063319.

Adding to 621422440 its reverse (44224126), we get a palindrome (665646566).

The spelling of 621422440 in words is "six hundred twenty-one million, four hundred twenty-two thousand, four hundred forty".