1690273728 has 168 divisors, whose sum is σ = 5692146096. Its totient is φ = 472780800.

The previous prime is 1690273727. The next prime is 1690273759. The reversal of 1690273728 is 8273720961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690273727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72108 + ... + 92628.

It is an arithmetic number, because the mean of its divisors is an integer number (33881822).

Almost surely, 2^1690273728 is an apocalyptic number.

1690273728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690273728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2846073048).

1690273728 is an abundant number, since it is smaller than the sum of its proper divisors (4001872368).

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

1690273728 is a wasteful number, since it uses less digits than its factorization.

1690273728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20563 (or 20550 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1690273728 is about 41112.9386933116. The cubic root of 1690273728 is about 1191.2027309829.

The spelling of 1690273728 in words is "one billion, six hundred ninety million, two hundred seventy-three thousand, seven hundred twenty-eight".