52161640 has 32 divisors (see below), whose sum is σ = 117602280. Its totient is φ = 20822272.

The previous prime is 52161617. The next prime is 52161647. The reversal of 52161640 is 4616125.

It can be written as a sum of positive squares in 4 ways, for example, as 19236996 + 32924644 = 4386^2 + 5738^2 .

It is not an unprimeable number, because it can be changed into a prime (52161647) 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, 25122 + ... + 27118.

Almost surely, 2^52161640 is an apocalyptic number.

It is an amenable number.

52161640 is an abundant number, since it is smaller than the sum of its proper divisors (65440640).

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

52161640 is a wasteful number, since it uses less digits than its factorization.

52161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2657 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 52161640 is about 7222.3015722137. The cubic root of 52161640 is about 373.6374612235.

Adding to 52161640 its reverse (4616125), we get a palindrome (56777765).

The spelling of 52161640 in words is "fifty-two million, one hundred sixty-one thousand, six hundred forty".