690572018 has 4 divisors (see below), whose sum is σ = 1035858030. Its totient is φ = 345286008.

The previous prime is 690572017. The next prime is 690572021. The reversal of 690572018 is 810275096.

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

It can be written as a sum of positive squares in only one way, i.e., 482549089 + 208022929 = 21967^2 + 14423^2 .

It is not an unprimeable number, because it can be changed into a prime (690572017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172643003 + ... + 172643006.

Almost surely, 2^690572018 is an apocalyptic number.

690572018 is a deficient number, since it is larger than the sum of its proper divisors (345286012).

690572018 is a wasteful number, since it uses less digits than its factorization.

690572018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345286011.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 690572018 is about 26278.7369940033. The cubic root of 690572018 is about 883.8997117039.

The spelling of 690572018 in words is "six hundred ninety million, five hundred seventy-two thousand, eighteen".