1645247560 has 32 divisors (see below), whose sum is σ = 4038336000. Its totient is φ = 598271680.

The previous prime is 1645247537. The next prime is 1645247567. The reversal of 1645247560 is 657425461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1645247567) 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 7 ways as a sum of consecutive naturals, for example, 1869160 + ... + 1870039.

It is an arithmetic number, because the mean of its divisors is an integer number (126198000).

Almost surely, 2^1645247560 is an apocalyptic number.

1645247560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645247560 is an abundant number, since it is smaller than the sum of its proper divisors (2393088440).

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

1645247560 is a wasteful number, since it uses less digits than its factorization.

1645247560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739221 (or 3739217 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 1645247560 is about 40561.6513470544. The cubic root of 1645247560 is about 1180.5301553390.

The spelling of 1645247560 in words is "one billion, six hundred forty-five million, two hundred forty-seven thousand, five hundred sixty".