671374144 has 56 divisors (see below), whose sum is σ = 1526316480. Its totient is φ = 287026176.

The previous prime is 671374141. The next prime is 671374199. The reversal of 671374144 is 441473176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-3 number, since 3×671374144³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671374141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207612 + ... + 210820.

Almost surely, 2^671374144 is an apocalyptic number.

671374144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671374144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763158240).

671374144 is an abundant number, since it is smaller than the sum of its proper divisors (854942336).

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

671374144 is a wasteful number, since it uses less digits than its factorization.

671374144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695 (or 3685 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 671374144 is about 25910.8885220094. Note that the first 3 decimals coincide. The cubic root of 671374144 is about 875.6318240407.

The spelling of 671374144 in words is "six hundred seventy-one million, three hundred seventy-four thousand, one hundred forty-four".