291492983640 has 64 divisors (see below), whose sum is σ = 874572622560. Its totient is φ = 77723136000.

The previous prime is 291492983633. The next prime is 291492983641. The reversal of 291492983640 is 46389294192.

It is a super-2 number, since 2×291492983640² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291492983641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038390 + ... + 1288890.

Almost surely, 2^291492983640 is an apocalyptic number.

291492983640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291492983640 is an abundant number, since it is smaller than the sum of its proper divisors (583079638920).

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

291492983640 is a wasteful number, since it uses less digits than its factorization.

291492983640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260212 (or 260208 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 291492983640 in words is "two hundred ninety-one billion, four hundred ninety-two million, nine hundred eighty-three thousand, six hundred forty".