690218641 has 16 divisors (see below), whose sum is σ = 825269760. Its totient is φ = 564894720.

The previous prime is 690218623. The next prime is 690218651. The reversal of 690218641 is 146812096.

It is a happy number.

It is not a de Polignac number, because 690218641 - 2⁹ = 690218129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690218641.

It is not an unprimeable number, because it can be changed into a prime (690218611) 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, 12096 + ... + 39073.

It is an arithmetic number, because the mean of its divisors is an integer number (51579360).

Almost surely, 2^690218641 is an apocalyptic number.

It is an amenable number.

690218641 is a deficient number, since it is larger than the sum of its proper divisors (135051119).

690218641 is a wasteful number, since it uses less digits than its factorization.

690218641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51264.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 690218641 is about 26272.0125038034. The cubic root of 690218641 is about 883.7489173317.

The spelling of 690218641 in words is "six hundred ninety million, two hundred eighteen thousand, six hundred forty-one".