690380655 has 8 divisors (see below), whose sum is σ = 1104609072. Its totient is φ = 368203008.

The previous prime is 690380651. The next prime is 690380671. The reversal of 690380655 is 556083096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690380655 - 2² = 690380651 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690380651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23012674 + ... + 23012703.

It is an arithmetic number, because the mean of its divisors is an integer number (138076134).

Almost surely, 2^690380655 is an apocalyptic number.

690380655 is a deficient number, since it is larger than the sum of its proper divisors (414228417).

690380655 is a wasteful number, since it uses less digits than its factorization.

690380655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46025385.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 690380655 is about 26275.0957181891. The cubic root of 690380655 is about 883.8180589473.

The spelling of 690380655 in words is "six hundred ninety million, three hundred eighty thousand, six hundred fifty-five".