1878164640 has 144 divisors (see below), whose sum is σ = 6991953696. Its totient is φ = 455308800.

The previous prime is 1878164627. The next prime is 1878164653. The reversal of 1878164640 is 464618781.

1878164640 is a `hidden beast` number, since 187 + 8 + 1 + 6 + 464 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1878164627) and next prime (1878164653).

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43446 + ... + 75125.

It is an arithmetic number, because the mean of its divisors is an integer number (48555234).

Almost surely, 2^1878164640 is an apocalyptic number.

1878164640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1878164640 is an abundant number, since it is smaller than the sum of its proper divisors (5113789056).

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

1878164640 is a wasteful number, since it uses less digits than its factorization.

1878164640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118603 (or 118592 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1878164640 is about 43337.7968983196. The cubic root of 1878164640 is about 1233.7993959707.

The spelling of 1878164640 in words is "one billion, eight hundred seventy-eight million, one hundred sixty-four thousand, six hundred forty".