690428047 has 2 divisors, whose sum is σ = 690428048. Its totient is φ = 690428046.

The previous prime is 690428003. The next prime is 690428059. The reversal of 690428047 is 740824096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690428047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690428747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345214023 + 345214024.

It is an arithmetic number, because the mean of its divisors is an integer number (345214024).

Almost surely, 2^690428047 is an apocalyptic number.

690428047 is a deficient number, since it is larger than the sum of its proper divisors (1).

690428047 is an equidigital number, since it uses as much as digits as its factorization.

690428047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 690428047 is about 26275.9975452884. The cubic root of 690428047 is about 883.8382820646.

The spelling of 690428047 in words is "six hundred ninety million, four hundred twenty-eight thousand, forty-seven".