1679643420 has 96 divisors (see below), whose sum is σ = 5788328448. Its totient is φ = 354385152.

The previous prime is 1679643419. The next prime is 1679643421. The reversal of 1679643420 is 243469761.

It is an interprime number because it is at equal distance from previous prime (1679643419) and next prime (1679643421).

It is a super-3 number, since 3×1679643420³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679643421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148354 + ... + 159273.

It is an arithmetic number, because the mean of its divisors is an integer number (60295088).

Almost surely, 2^1679643420 is an apocalyptic number.

1679643420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1679643420 is an abundant number, since it is smaller than the sum of its proper divisors (4108685028).

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

1679643420 is a wasteful number, since it uses less digits than its factorization.

1679643420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307659 (or 307657 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 1679643420 is about 40983.4530024009. The cubic root of 1679643420 is about 1188.7002781058.

The spelling of 1679643420 in words is "one billion, six hundred seventy-nine million, six hundred forty-three thousand, four hundred twenty".