690474906 has 48 divisors (see below), whose sum is σ = 1648902528. Its totient is φ = 207072000.

The previous prime is 690474899. The next prime is 690474947. The reversal of 690474906 is 609474096.

690474906 is a `hidden beast` number, since 6 + 90 + 474 + 90 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1231 + ... + 37181.

It is an arithmetic number, because the mean of its divisors is an integer number (34352136).

Almost surely, 2^690474906 is an apocalyptic number.

690474906 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 690474906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824451264).

690474906 is an abundant number, since it is smaller than the sum of its proper divisors (958427622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690474906 is a wasteful number, since it uses less digits than its factorization.

690474906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36067 (or 36064 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 690474906 is about 26276.8891994467. The cubic root of 690474906 is about 883.8582768304.

It can be divided in two parts, 6904 and 74906, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 690474906 in words is "six hundred ninety million, four hundred seventy-four thousand, nine hundred six".