664161240 has 32 divisors (see below), whose sum is σ = 1992484080. Its totient is φ = 177109632.

The previous prime is 664161221. The next prime is 664161241. The reversal of 664161240 is 42161466.

664161240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664161240² = 882220305436675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 664161198 and 664161207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664161241) 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, 2767219 + ... + 2767458.

Almost surely, 2^664161240 is an apocalyptic number.

664161240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664161240 is an abundant number, since it is smaller than the sum of its proper divisors (1328322840).

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

664161240 is a wasteful number, since it uses less digits than its factorization.

664161240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534691 (or 5534687 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 664161240 is about 25771.3259263081. The cubic root of 664161240 is about 872.4847450693.

The spelling of 664161240 in words is "six hundred sixty-four million, one hundred sixty-one thousand, two hundred forty".