1645937436 has 96 divisors (see below), whose sum is σ = 4657637376. Its totient is φ = 445536000.

The previous prime is 1645937417. The next prime is 1645937459. The reversal of 1645937436 is 6347395461.

It is a super-2 number, since 2×1645937436² = 5418220086452508192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37726 + ... + 68666.

It is an arithmetic number, because the mean of its divisors is an integer number (48517056).

Almost surely, 2^1645937436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645937436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328818688).

1645937436 is an abundant number, since it is smaller than the sum of its proper divisors (3011699940).

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

1645937436 is a wasteful number, since it uses less digits than its factorization.

1645937436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31003 (or 31001 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The square root of 1645937436 is about 40570.1544981037. The cubic root of 1645937436 is about 1180.6951367143.

The spelling of 1645937436 in words is "one billion, six hundred forty-five million, nine hundred thirty-seven thousand, four hundred thirty-six".