690507122 has 18 divisors (see below), whose sum is σ = 1101279303. Its totient is φ = 324647232.

The previous prime is 690507121. The next prime is 690507131. The reversal of 690507122 is 221705096.

It can be written as a sum of positive squares in 5 ways, for example, as 669722641 + 20784481 = 25879^2 + 4559^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18581.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690507121) 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 in 8 ways as a sum of consecutive naturals, for example, 631208 + ... + 632300.

Almost surely, 2^690507122 is an apocalyptic number.

690507122 is a deficient number, since it is larger than the sum of its proper divisors (410772181).

690507122 is an equidigital number, since it uses as much as digits as its factorization.

690507122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 690507122 is about 26277.5022024545. The cubic root of 690507122 is about 883.8720228937.

Multiplying 690507122 by its sum of digits (32), we get a square (22096227904 = 148648²).

The spelling of 690507122 in words is "six hundred ninety million, five hundred seven thousand, one hundred twenty-two".