291664040 has 16 divisors (see below), whose sum is σ = 656244180. Its totient is φ = 116665600.

The previous prime is 291664039. The next prime is 291664069. The reversal of 291664040 is 40466192.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 278689636 + 12974404 = 16694^2 + 3602^2 .

It is a super-3 number, since 3×291664040³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 291663988 and 291664006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3645761 + ... + 3645840.

Almost surely, 2^291664040 is an apocalyptic number.

291664040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291664040 is an abundant number, since it is smaller than the sum of its proper divisors (364580140).

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

291664040 is a wasteful number, since it uses less digits than its factorization.

291664040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7291612 (or 7291608 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 291664040 is about 17078.1743755004. The cubic root of 291664040 is about 663.1742105183.

The spelling of 291664040 in words is "two hundred ninety-one million, six hundred sixty-four thousand, forty".