263620434 has 64 divisors (see below), whose sum is σ = 685946880. Its totient is φ = 65493120.

The previous prime is 263620433. The next prime is 263620439. The reversal of 263620434 is 434026362.

It is a happy number.

It is a super-4 number, since 4×263620434⁴ (a number of 35 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (263620433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1779 + ... + 23030.

It is an arithmetic number, because the mean of its divisors is an integer number (10717920).

Almost surely, 2^263620434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263620434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342973440).

263620434 is an abundant number, since it is smaller than the sum of its proper divisors (422326446).

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

263620434 is a wasteful number, since it uses less digits than its factorization.

263620434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24855.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 263620434 is about 16236.3922716840. The cubic root of 263620434 is about 641.1992763742.

Adding to 263620434 its reverse (434026362), we get a palindrome (697646796).

The spelling of 263620434 in words is "two hundred sixty-three million, six hundred twenty thousand, four hundred thirty-four".