3645778994 has 128 divisors (see below), whose sum is σ = 6931685376. Its totient is φ = 1415232000.

The previous prime is 3645778987. The next prime is 3645779021. The reversal of 3645778994 is 4998775463.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27830309 + ... + 27830439.

It is an arithmetic number, because the mean of its divisors is an integer number (54153792).

Almost surely, 2^3645778994 is an apocalyptic number.

3645778994 is a deficient number, since it is larger than the sum of its proper divisors (3285906382).

3645778994 is a wasteful number, since it uses less digits than its factorization.

3645778994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 45722880, while the sum is 62.

The square root of 3645778994 is about 60380.2864683499. The cubic root of 3645778994 is about 1539.0879788502.

The spelling of 3645778994 in words is "three billion, six hundred forty-five million, seven hundred seventy-eight thousand, nine hundred ninety-four".