1690043456 has 28 divisors (see below), whose sum is σ = 3375061068. Its totient is φ = 839634432.

The previous prime is 1690043431. The next prime is 1690043471. The reversal of 1690043456 is 6543400961.

It can be written as a sum of positive squares in 2 ways, for example, as 970945600 + 719097856 = 31160^2 + 26816^2 .

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, 74051 + ... + 94146.

Almost surely, 2^1690043456 is an apocalyptic number.

1690043456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1690043456 is a deficient number, since it is larger than the sum of its proper divisors (1685017612).

1690043456 is a wasteful number, since it uses less digits than its factorization.

1690043456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168366 (or 168356 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1690043456 is about 41110.1381170144. The cubic root of 1690043456 is about 1191.1486345984.

The spelling of 1690043456 in words is "one billion, six hundred ninety million, forty-three thousand, four hundred fifty-six".