690547738 has 4 divisors (see below), whose sum is σ = 1035821610. Its totient is φ = 345273868.

The previous prime is 690547733. The next prime is 690547747. The reversal of 690547738 is 837745096.

It is a happy number.

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., 376088449 + 314459289 = 19393^2 + 17733^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 690547691 and 690547700.

It is not an unprimeable number, because it can be changed into a prime (690547733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172636933 + ... + 172636936.

Almost surely, 2^690547738 is an apocalyptic number.

690547738 is a deficient number, since it is larger than the sum of its proper divisors (345273872).

690547738 is a wasteful number, since it uses less digits than its factorization.

690547738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345273871.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 690547738 is about 26278.2750194909. The cubic root of 690547738 is about 883.8893524964.

The spelling of 690547738 in words is "six hundred ninety million, five hundred forty-seven thousand, seven hundred thirty-eight".