1520650818 has 24 divisors (see below), whose sum is σ = 3315735228. Its totient is φ = 503654112.

The previous prime is 1520650811. The next prime is 1520650823. The reversal of 1520650818 is 8180560251.

1520650818 is a `hidden beast` number, since 1 + 520 + 6 + 50 + 81 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1302704649 + 217946169 = 36093^2 + 14763^2 .

It is not an unprimeable number, because it can be changed into a prime (1520650811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266221 + ... + 271872.

Almost surely, 2^1520650818 is an apocalyptic number.

1520650818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1520650818 is an abundant number, since it is smaller than the sum of its proper divisors (1795084410).

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

1520650818 is a wasteful number, since it uses less digits than its factorization.

1520650818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538258 (or 538255 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 1520650818 is about 38995.5230507298. The cubic root of 1520650818 is about 1149.9434926236.

The spelling of 1520650818 in words is "one billion, five hundred twenty million, six hundred fifty thousand, eight hundred eighteen".