678632019 has 16 divisors (see below), whose sum is σ = 977905152. Its totient is φ = 416137248.

The previous prime is 678631969. The next prime is 678632069. The reversal of 678632019 is 910236876.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (678631969) and next prime (678632069).

It is not a de Polignac number, because 678632019 - 2⁹ = 678631507 is a prime.

It is a super-2 number, since 2×678632019² = 921082834424032722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678632069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19707 + ... + 41780.

It is an arithmetic number, because the mean of its divisors is an integer number (61119072).

Almost surely, 2^678632019 is an apocalyptic number.

678632019 is a deficient number, since it is larger than the sum of its proper divisors (299273133).

678632019 is a wasteful number, since it uses less digits than its factorization.

678632019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61786.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 678632019 is about 26050.5665773319. The cubic root of 678632019 is about 878.7758542993.

The spelling of 678632019 in words is "six hundred seventy-eight million, six hundred thirty-two thousand, nineteen".