684528407 has 2 divisors, whose sum is σ = 684528408. Its totient is φ = 684528406.

The previous prime is 684528389. The next prime is 684528413. The reversal of 684528407 is 704825486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684528407 - 2¹² = 684524311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684528487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342264203 + 342264204.

It is an arithmetic number, because the mean of its divisors is an integer number (342264204).

Almost surely, 2^684528407 is an apocalyptic number.

684528407 is a deficient number, since it is larger than the sum of its proper divisors (1).

684528407 is an equidigital number, since it uses as much as digits as its factorization.

684528407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 44.

The square root of 684528407 is about 26163.4937842789. The cubic root of 684528407 is about 881.3136402442.

The spelling of 684528407 in words is "six hundred eighty-four million, five hundred twenty-eight thousand, four hundred seven".