1645371448 has 32 divisors (see below), whose sum is σ = 3528345600. Its totient is φ = 704649312.

The previous prime is 1645371439. The next prime is 1645371449. The reversal of 1645371448 is 8441735461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645371449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73393 + ... + 93151.

It is an arithmetic number, because the mean of its divisors is an integer number (110260800).

Almost surely, 2^1645371448 is an apocalyptic number.

It is an amenable number.

1645371448 is an abundant number, since it is smaller than the sum of its proper divisors (1882974152).

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

1645371448 is a wasteful number, since it uses less digits than its factorization.

1645371448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21259 (or 21255 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 1645371448 is about 40563.1784750653. The cubic root of 1645371448 is about 1180.5597861076.

The spelling of 1645371448 in words is "one billion, six hundred forty-five million, three hundred seventy-one thousand, four hundred forty-eight".