1964645478 has 12 divisors (see below), whose sum is σ = 4256731908. Its totient is φ = 654881820.

The previous prime is 1964645461. The next prime is 1964645497. The reversal of 1964645478 is 8745464691.

1964645478 is a `hidden beast` number, since 1 + 96 + 4 + 6 + 4 + 547 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54573468 + ... + 54573503.

It is an arithmetic number, because the mean of its divisors is an integer number (354727659).

Almost surely, 2^1964645478 is an apocalyptic number.

1964645478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1964645478 is an abundant number, since it is smaller than the sum of its proper divisors (2292086430).

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

1964645478 is a wasteful number, since it uses less digits than its factorization.

1964645478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109146979 (or 109146976 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 1964645478 is about 44324.3215176499. The cubic root of 1964645478 is about 1252.4528855071.

The spelling of 1964645478 in words is "one billion, nine hundred sixty-four million, six hundred forty-five thousand, four hundred seventy-eight".