263420388 has 216 divisors, whose sum is σ = 857473344. Its totient is φ = 66718080.

The previous prime is 263420371. The next prime is 263420393. The reversal of 263420388 is 883024362.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1615995 + ... + 1616157.

It is an arithmetic number, because the mean of its divisors is an integer number (3969784).

Almost surely, 2^263420388 is an apocalyptic number.

263420388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263420388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428736672).

263420388 is an abundant number, since it is smaller than the sum of its proper divisors (594052956).

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

263420388 is a wasteful number, since it uses less digits than its factorization.

263420388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 263420388 is about 16230.2306822793. The cubic root of 263420388 is about 641.0370458931.

The spelling of 263420388 in words is "two hundred sixty-three million, four hundred twenty thousand, three hundred eighty-eight".