1320515772 has 24 divisors (see below), whose sum is σ = 3082060800. Its totient is φ = 440049456.

The previous prime is 1320515771. The next prime is 1320515821. The reversal of 1320515772 is 2775150231.

It is a happy number.

It is a super-3 number, since 3×1320515772³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320515771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36679 + ... + 63137.

It is an arithmetic number, because the mean of its divisors is an integer number (128419200).

Almost surely, 2^1320515772 is an apocalyptic number.

1320515772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1320515772 is an abundant number, since it is smaller than the sum of its proper divisors (1761545028).

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

1320515772 is a wasteful number, since it uses less digits than its factorization.

1320515772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30625 (or 30623 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 1320515772 is about 36338.9016344743. The cubic root of 1320515772 is about 1097.1041661063.

The spelling of 1320515772 in words is "one billion, three hundred twenty million, five hundred fifteen thousand, seven hundred seventy-two".