511413640 has 32 divisors (see below), whose sum is σ = 1152613080. Its totient is φ = 204221952.

The previous prime is 511413631. The next prime is 511413649. The reversal of 511413640 is 46314115.

It is an interprime number because it is at equal distance from previous prime (511413631) and next prime (511413649).

It can be written as a sum of positive squares in 4 ways, for example, as 388957284 + 122456356 = 19722^2 + 11066^2 .

It is a super-2 number, since 2×511413640² = 523087822356099200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (511413649) 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, 14092 + ... + 34948.

Almost surely, 2^511413640 is an apocalyptic number.

It is an amenable number.

511413640 is an abundant number, since it is smaller than the sum of its proper divisors (641199440).

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

511413640 is a wasteful number, since it uses less digits than its factorization.

511413640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21481 (or 21477 counting only the distinct ones).

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

The square root of 511413640 is about 22614.4564383051. The cubic root of 511413640 is about 799.6944875092.

Adding to 511413640 its reverse (46314115), we get a palindrome (557727755).

The spelling of 511413640 in words is "five hundred eleven million, four hundred thirteen thousand, six hundred forty".