1491291768 has 32 divisors (see below), whose sum is σ = 3729940560. Its totient is φ = 496869120.

The previous prime is 1491291757. The next prime is 1491291803. The reversal of 1491291768 is 8671921941.

1491291768 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1491291768² = 4447902274609131648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43978 + ... + 70118.

Almost surely, 2^1491291768 is an apocalyptic number.

It is an amenable number.

1491291768 is an abundant number, since it is smaller than the sum of its proper divisors (2238648792).

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

1491291768 is a wasteful number, since it uses less digits than its factorization.

1491291768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28527 (or 28523 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The square root of 1491291768 is about 38617.2470277207. The cubic root of 1491291768 is about 1142.4947336190.

The spelling of 1491291768 in words is "one billion, four hundred ninety-one million, two hundred ninety-one thousand, seven hundred sixty-eight".