1990756815 has 8 divisors (see below), whose sum is σ = 3185210928. Its totient is φ = 1061736960.

The previous prime is 1990756811. The next prime is 1990756829. The reversal of 1990756815 is 5186570991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1990756815 - 2² = 1990756811 is a prime.

It is a super-2 number, since 2×1990756815² = 7926225392937888450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990756811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66358546 + ... + 66358575.

It is an arithmetic number, because the mean of its divisors is an integer number (398151366).

Almost surely, 2^1990756815 is an apocalyptic number.

1990756815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1990756815 is a deficient number, since it is larger than the sum of its proper divisors (1194454113).

1990756815 is a wasteful number, since it uses less digits than its factorization.

1990756815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132717129.

The product of its (nonzero) digits is 680400, while the sum is 51.

The square root of 1990756815 is about 44617.8979222464. The cubic root of 1990756815 is about 1257.9771048800.

The spelling of 1990756815 in words is "one billion, nine hundred ninety million, seven hundred fifty-six thousand, eight hundred fifteen".