262161640 has 32 divisors (see below), whose sum is σ = 635239080. Its totient is φ = 96797952.

The previous prime is 262161631. The next prime is 262161643. The reversal of 262161640 is 46161262.

It can be written as a sum of positive squares in 4 ways, for example, as 115218756 + 146942884 = 10734^2 + 12122^2 .

It is a junction number, because it is equal to n+sod(n) for n = 262161599 and 262161608.

It is not an unprimeable number, because it can be changed into a prime (262161643) 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, 251559 + ... + 252598.

Almost surely, 2^262161640 is an apocalyptic number.

262161640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

262161640 is an abundant number, since it is smaller than the sum of its proper divisors (373077440).

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

262161640 is a wasteful number, since it uses less digits than its factorization.

262161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504181 (or 504177 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 262161640 is about 16191.4063626357. The cubic root of 262161640 is about 640.0143551468.

It can be divided in two parts, 2621 and 61640, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 262161640 in words is "two hundred sixty-two million, one hundred sixty-one thousand, six hundred forty".