1678371840 has 528 divisors, whose sum is σ = 6437733120. Its totient is φ = 418037760.

The previous prime is 1678371823. The next prime is 1678371857. The reversal of 1678371840 is 481738761.

It is an interprime number because it is at equal distance from previous prime (1678371823) and next prime (1678371857).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23639005 + ... + 23639075.

Almost surely, 2^1678371840 is an apocalyptic number.

1678371840 is a gapful number since it is divisible by the number (10) 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 1678371840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3218866560).

1678371840 is an abundant number, since it is smaller than the sum of its proper divisors (4759361280).

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

1678371840 is an equidigital number, since it uses as much as digits as its factorization.

1678371840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 1678371840 is about 40967.9367310584. The cubic root of 1678371840 is about 1188.4002324576.

The spelling of 1678371840 in words is "one billion, six hundred seventy-eight million, three hundred seventy-one thousand, eight hundred forty".