1581490896 has 20 divisors (see below), whose sum is σ = 4085518272. Its totient is φ = 527163616.

The previous prime is 1581490871. The next prime is 1581490949. The reversal of 1581490896 is 6980941851.

It is a super-2 number, since 2×1581490896² = 5002226908261765632, 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 3 ways as a sum of consecutive naturals, for example, 16473816 + ... + 16473911.

Almost surely, 2^1581490896 is an apocalyptic number.

1581490896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1581490896 is an abundant number, since it is smaller than the sum of its proper divisors (2504027376).

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

1581490896 is a wasteful number, since it uses less digits than its factorization.

1581490896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32947738 (or 32947732 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 1581490896 is about 39767.9631864646. The cubic root of 1581490896 is about 1165.0795124619.

The spelling of 1581490896 in words is "one billion, five hundred eighty-one million, four hundred ninety thousand, eight hundred ninety-six".