1671732678 has 128 divisors (see below), whose sum is σ = 4314746880. Its totient is φ = 419253120.

The previous prime is 1671732677. The next prime is 1671732679. The reversal of 1671732678 is 8762371761.

It is an interprime number because it is at equal distance from previous prime (1671732677) and next prime (1671732679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671732677) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1640053 + ... + 1641071.

It is an arithmetic number, because the mean of its divisors is an integer number (33708960).

Almost surely, 2^1671732678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671732678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2157373440).

1671732678 is an abundant number, since it is smaller than the sum of its proper divisors (2643014202).

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

1671732678 is a wasteful number, since it uses less digits than its factorization.

1671732678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 592704, while the sum is 48.

The square root of 1671732678 is about 40886.8276832527. The cubic root of 1671732678 is about 1186.8311705236.

The spelling of 1671732678 in words is "one billion, six hundred seventy-one million, seven hundred thirty-two thousand, six hundred seventy-eight".