194778045 has 96 divisors (see below), whose sum is σ = 427714560. Its totient is φ = 79643520.

The previous prime is 194778043. The next prime is 194778079. The reversal of 194778045 is 540877491.

It is a happy number.

It is not a de Polignac number, because 194778045 - 2¹ = 194778043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194778041) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 231736 + ... + 232574.

It is an arithmetic number, because the mean of its divisors is an integer number (4455360).

Almost surely, 2^194778045 is an apocalyptic number.

194778045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

194778045 is an abundant number, since it is smaller than the sum of its proper divisors (232936515).

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

194778045 is a wasteful number, since it uses less digits than its factorization.

194778045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 194778045 is about 13956.2905171826. The cubic root of 194778045 is about 579.6689004017.

The spelling of 194778045 in words is "one hundred ninety-four million, seven hundred seventy-eight thousand, forty-five".