690345523 has 4 divisors (see below), whose sum is σ = 788966320. Its totient is φ = 591724728.

The previous prime is 690345517. The next prime is 690345547. The reversal of 690345523 is 325543096.

690345523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 690345523 - 2²¹ = 688248371 is a prime.

It is a super-2 number, since 2×690345523² = 953153882252287058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690345583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49310388 + ... + 49310401.

It is an arithmetic number, because the mean of its divisors is an integer number (197241580).

Almost surely, 2^690345523 is an apocalyptic number.

690345523 is a deficient number, since it is larger than the sum of its proper divisors (98620797).

690345523 is an equidigital number, since it uses as much as digits as its factorization.

690345523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98620796.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 690345523 is about 26274.4271678756. The cubic root of 690345523 is about 883.8030668206.

The spelling of 690345523 in words is "six hundred ninety million, three hundred forty-five thousand, five hundred twenty-three".