1906728990 has 64 divisors (see below), whose sum is σ = 4645555200. Its totient is φ = 500782464.

The previous prime is 1906728977. The next prime is 1906729031. The reversal of 1906728990 is 998276091.

It is a happy number.

It is a super-3 number, since 3×1906728990³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1333596 + ... + 1335024.

It is an arithmetic number, because the mean of its divisors is an integer number (72586800).

Almost surely, 2^1906728990 is an apocalyptic number.

1906728990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1906728990 is an abundant number, since it is smaller than the sum of its proper divisors (2738826210).

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

1906728990 is a wasteful number, since it uses less digits than its factorization.

1906728990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081.

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 1906728990 is about 43666.1080244164. The cubic root of 1906728990 is about 1240.0227601615.

The spelling of 1906728990 in words is "one billion, nine hundred six million, seven hundred twenty-eight thousand, nine hundred ninety".