1645155408 has 160 divisors (see below), whose sum is σ = 4839690240. Its totient is φ = 477734400.

The previous prime is 1645155401. The next prime is 1645155409. The reversal of 1645155408 is 8045515461.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645155401) 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 31 ways as a sum of consecutive naturals, for example, 1133083 + ... + 1134533.

It is an arithmetic number, because the mean of its divisors is an integer number (30248064).

Almost surely, 2^1645155408 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 1645155408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419845120).

1645155408 is an abundant number, since it is smaller than the sum of its proper divisors (3194534832).

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

1645155408 is a wasteful number, since it uses less digits than its factorization.

1645155408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 1645155408 is about 40560.5153813410. The cubic root of 1645155408 is about 1180.5081140266.

The spelling of 1645155408 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, four hundred eight".