690531649 has 16 divisors (see below), whose sum is σ = 735396480. Its totient is φ = 646565760.

The previous prime is 690531643. The next prime is 690531671. The reversal of 690531649 is 946135096.

It is a cyclic number.

It is not a de Polignac number, because 690531649 - 2⁵ = 690531617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690531643) 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, 809107 + ... + 809959.

It is an arithmetic number, because the mean of its divisors is an integer number (45962280).

Almost surely, 2^690531649 is an apocalyptic number.

It is an amenable number.

690531649 is a deficient number, since it is larger than the sum of its proper divisors (44864831).

690531649 is a wasteful number, since it uses less digits than its factorization.

690531649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 690531649 is about 26277.9688903081. The cubic root of 690531649 is about 883.8824878944.

The spelling of 690531649 in words is "six hundred ninety million, five hundred thirty-one thousand, six hundred forty-nine".