1545645720 has 64 divisors (see below), whose sum is σ = 4641660000. Its totient is φ = 411752448.

The previous prime is 1545645679. The next prime is 1545645721. The reversal of 1545645720 is 275465451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1545645721) 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 15 ways as a sum of consecutive naturals, for example, 122256 + ... + 134304.

Almost surely, 2^1545645720 is an apocalyptic number.

1545645720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1545645720 is an abundant number, since it is smaller than the sum of its proper divisors (3096014280).

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

1545645720 is a wasteful number, since it uses less digits than its factorization.

1545645720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13132 (or 13128 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 39.

The square root of 1545645720 is about 39314.7010671581. The cubic root of 1545645720 is about 1156.2098153261.

The spelling of 1545645720 in words is "one billion, five hundred forty-five million, six hundred forty-five thousand, seven hundred twenty".