1688553340 has 24 divisors (see below), whose sum is σ = 3546869760. Its totient is φ = 675248448.

The previous prime is 1688553329. The next prime is 1688553343. The reversal of 1688553340 is 433558861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688553343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94134 + ... + 110626.

It is an arithmetic number, because the mean of its divisors is an integer number (147786240).

Almost surely, 2^1688553340 is an apocalyptic number.

1688553340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688553340 is an abundant number, since it is smaller than the sum of its proper divisors (1858316420).

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

1688553340 is a wasteful number, since it uses less digits than its factorization.

1688553340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21621 (or 21619 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1688553340 is about 41092.0106590077. The cubic root of 1688553340 is about 1190.7984519748.

It can be divided in two parts, 16885 and 53340, that added together give a square (70225 = 265²).

The spelling of 1688553340 in words is "one billion, six hundred eighty-eight million, five hundred fifty-three thousand, three hundred forty".