1645513936 has 20 divisors (see below), whose sum is σ = 3478018464. Its totient is φ = 747960800.

The previous prime is 1645513931. The next prime is 1645513973. The reversal of 1645513936 is 6393155461.

It is a happy number.

It is a super-2 number, since 2×1645513936² = 5415432227140424192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645513892 and 1645513901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645513931) 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, 4674580 + ... + 4674931.

Almost surely, 2^1645513936 is an apocalyptic number.

1645513936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1645513936 is an abundant number, since it is smaller than the sum of its proper divisors (1832504528).

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

1645513936 is a wasteful number, since it uses less digits than its factorization.

1645513936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9349530 (or 9349524 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The square root of 1645513936 is about 40564.9348082799. The cubic root of 1645513936 is about 1180.5938636705.

The spelling of 1645513936 in words is "one billion, six hundred forty-five million, five hundred thirteen thousand, nine hundred thirty-six".