1945536678 has 64 divisors (see below), whose sum is σ = 4586915520. Its totient is φ = 609140736.

The previous prime is 1945536653. The next prime is 1945536689. The reversal of 1945536678 is 8766355491.

1945536678 is a `hidden beast` number, since 1 + 9 + 45 + 536 + 67 + 8 = 666.

It is a super-2 number, since 2×1945536678² = 7570225930886551368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527850 + ... + 531522.

It is an arithmetic number, because the mean of its divisors is an integer number (71670555).

Almost surely, 2^1945536678 is an apocalyptic number.

1945536678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1945536678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293457760).

1945536678 is an abundant number, since it is smaller than the sum of its proper divisors (2641378842).

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

1945536678 is a wasteful number, since it uses less digits than its factorization.

1945536678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278 (or 4272 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 1945536678 is about 44108.2382101122. The cubic root of 1945536678 is about 1248.3790569167.

The spelling of 1945536678 in words is "one billion, nine hundred forty-five million, five hundred thirty-six thousand, six hundred seventy-eight".