690965856 has 288 divisors, whose sum is σ = 2470608000. Its totient is φ = 186810624.

The previous prime is 690965819. The next prime is 690965857. The reversal of 690965856 is 658569096.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690965857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 803955 + ... + 804813.

It is an arithmetic number, because the mean of its divisors is an integer number (8578500).

Almost surely, 2^690965856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690965856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235304000).

690965856 is an abundant number, since it is smaller than the sum of its proper divisors (1779642144).

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

690965856 is a wasteful number, since it uses less digits than its factorization.

690965856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The square root of 690965856 is about 26286.2293986795. The cubic root of 690965856 is about 884.0677111447.

The spelling of 690965856 in words is "six hundred ninety million, nine hundred sixty-five thousand, eight hundred fifty-six".