1649851806 has 32 divisors (see below), whose sum is σ = 3414878208. Its totient is φ = 530845920.

The previous prime is 1649851783. The next prime is 1649851813. The reversal of 1649851806 is 6081589461.

It is a super-2 number, since 2×1649851806² = 5444021963522923272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62671 + ... + 85013.

It is an arithmetic number, because the mean of its divisors is an integer number (106714944).

Almost surely, 2^1649851806 is an apocalyptic number.

1649851806 is an abundant number, since it is smaller than the sum of its proper divisors (1765026402).

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

1649851806 is a wasteful number, since it uses less digits than its factorization.

1649851806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22776.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 1649851806 is about 40618.3678401779. The cubic root of 1649851806 is about 1181.6303724842.

The spelling of 1649851806 in words is "one billion, six hundred forty-nine million, eight hundred fifty-one thousand, eight hundred six".