1645408734 has 8 divisors (see below), whose sum is σ = 3290817480. Its totient is φ = 548469576.

The previous prime is 1645408729. The next prime is 1645408777. The reversal of 1645408734 is 4378045461.

1645408734 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

1645408734 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137117389 + ... + 137117400.

It is an arithmetic number, because the mean of its divisors is an integer number (411352185).

Almost surely, 2^1645408734 is an apocalyptic number.

1645408734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1645408734 is a wasteful number, since it uses less digits than its factorization.

1645408734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274234794.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 1645408734 is about 40563.6380764842. The cubic root of 1645408734 is about 1180.5687036521.

The spelling of 1645408734 in words is "one billion, six hundred forty-five million, four hundred eight thousand, seven hundred thirty-four".