1220671520 has 24 divisors (see below), whose sum is σ = 2883836844. Its totient is φ = 488268544.

The previous prime is 1220671513. The next prime is 1220671523. The reversal of 1220671520 is 251760221.

It can be written as a sum of positive squares in 2 ways, for example, as 1210761616 + 9909904 = 34796^2 + 3148^2 .

It is a super-2 number, since 2×1220671520² = 2980077919478220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220671520.

It is not an unprimeable number, because it can be changed into a prime (1220671523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3814439 + ... + 3814758.

Almost surely, 2^1220671520 is an apocalyptic number.

1220671520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220671520 is an abundant number, since it is smaller than the sum of its proper divisors (1663165324).

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

1220671520 is an equidigital number, since it uses as much as digits as its factorization.

1220671520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629212 (or 7629204 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1220671520 is about 34938.1098515647. The cubic root of 1220671520 is about 1068.7257431199.

The spelling of 1220671520 in words is "one billion, two hundred twenty million, six hundred seventy-one thousand, five hundred twenty".