690243540 has 192 divisors, whose sum is σ = 2275983360. Its totient is φ = 153054720.

The previous prime is 690243527. The next prime is 690243553. The reversal of 690243540 is 45342096.

It is an interprime number because it is at equal distance from previous prime (690243527) and next prime (690243553).

It is a super-2 number, since 2×690243540² = 952872289023463200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 2355634 + ... + 2355926.

It is an arithmetic number, because the mean of its divisors is an integer number (11854080).

Almost surely, 2^690243540 is an apocalyptic number.

690243540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690243540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137991680).

690243540 is an abundant number, since it is smaller than the sum of its proper divisors (1585739820).

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

690243540 is a wasteful number, since it uses less digits than its factorization.

690243540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 690243540 is about 26272.4863688232. The cubic root of 690243540 is about 883.7595440126.

The spelling of 690243540 in words is "six hundred ninety million, two hundred forty-three thousand, five hundred forty".