1768090657 has 4 divisors (see below), whose sum is σ = 1861148080. Its totient is φ = 1675033236.

The previous prime is 1768090637. The next prime is 1768090663. The reversal of 1768090657 is 7560908671.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7560908671 = 37 ⋅204348883.

It is a de Polignac number, because none of the positive numbers 2^k-1768090657 is a prime.

It is a super-2 number, since 2×1768090657² = 6252289142741383298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1768090657.

It is not an unprimeable number, because it can be changed into a prime (1768090607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46528683 + ... + 46528720.

It is an arithmetic number, because the mean of its divisors is an integer number (465287020).

Almost surely, 2^1768090657 is an apocalyptic number.

It is an amenable number.

1768090657 is a deficient number, since it is larger than the sum of its proper divisors (93057423).

1768090657 is an equidigital number, since it uses as much as digits as its factorization.

1768090657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93057422.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 1768090657 is about 42048.6700978759. The cubic root of 1768090657 is about 1209.2093865381.

The spelling of 1768090657 in words is "one billion, seven hundred sixty-eight million, ninety thousand, six hundred fifty-seven".