1868687478 has 48 divisors (see below), whose sum is σ = 4639748256. Its totient is φ = 532465920.

The previous prime is 1868687467. The next prime is 1868687501. The reversal of 1868687478 is 8747868681.

1868687478 is a `hidden beast` number, since 1 + 8 + 6 + 86 + 87 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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, 27118 + ... + 66878.

It is an arithmetic number, because the mean of its divisors is an integer number (96661422).

Almost surely, 2^1868687478 is an apocalyptic number.

1868687478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1868687478 is an abundant number, since it is smaller than the sum of its proper divisors (2771060778).

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

1868687478 is a wasteful number, since it uses less digits than its factorization.

1868687478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40149 (or 40146 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The square root of 1868687478 is about 43228.3180103043. The cubic root of 1868687478 is about 1231.7206574707.

The spelling of 1868687478 in words is "one billion, eight hundred sixty-eight million, six hundred eighty-seven thousand, four hundred seventy-eight".