1678734957 has 4 divisors (see below), whose sum is σ = 2238313280. Its totient is φ = 1119156636.

The previous prime is 1678734931. The next prime is 1678734973. The reversal of 1678734957 is 7594378761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1678734957 - 2⁷ = 1678734829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1678734897 and 1678734906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678734907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279789157 + ... + 279789162.

It is an arithmetic number, because the mean of its divisors is an integer number (559578320).

Almost surely, 2^1678734957 is an apocalyptic number.

It is an amenable number.

1678734957 is a deficient number, since it is larger than the sum of its proper divisors (559578323).

1678734957 is an equidigital number, since it uses as much as digits as its factorization.

1678734957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559578322.

The product of its digits is 8890560, while the sum is 57.

The square root of 1678734957 is about 40972.3682132239. The cubic root of 1678734957 is about 1188.4859300367.

The spelling of 1678734957 in words is "one billion, six hundred seventy-eight million, seven hundred thirty-four thousand, nine hundred fifty-seven".