1320749520 has 40 divisors (see below), whose sum is σ = 4094324256. Its totient is φ = 352199808.

The previous prime is 1320749509. The next prime is 1320749543. The reversal of 1320749520 is 259470231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×1320749520³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2751322 + ... + 2751801.

Almost surely, 2^1320749520 is an apocalyptic number.

1320749520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320749520 is an abundant number, since it is smaller than the sum of its proper divisors (2773574736).

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

1320749520 is a wasteful number, since it uses less digits than its factorization.

1320749520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503139 (or 5503133 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1320749520 is about 36342.1177148498. The cubic root of 1320749520 is about 1097.1688960601.

The spelling of 1320749520 in words is "one billion, three hundred twenty million, seven hundred forty-nine thousand, five hundred twenty".