2174378640 has 80 divisors (see below), whose sum is σ = 7703518848. Its totient is φ = 497000448.

The previous prime is 2174378597. The next prime is 2174378641. The reversal of 2174378640 is 468734712.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 2174378592 and 2174378601.

It is not an unprimeable number, because it can be changed into a prime (2174378641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645457 + ... + 648816.

Almost surely, 2^2174378640 is an apocalyptic number.

2174378640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2174378640 is an abundant number, since it is smaller than the sum of its proper divisors (5529140208).

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

2174378640 is a wasteful number, since it uses less digits than its factorization.

2174378640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294296 (or 1294290 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 2174378640 is about 46630.2331111480. The cubic root of 2174378640 is about 1295.5227914599.

The spelling of 2174378640 in words is "two billion, one hundred seventy-four million, three hundred seventy-eight thousand, six hundred forty".