690778368 has 180 divisors, whose sum is σ = 2354524480. Its totient is φ = 197323776.

The previous prime is 690778367. The next prime is 690778381. The reversal of 690778368 is 863877096.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690778367) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 142773 + ... + 147531.

Almost surely, 2^690778368 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 690778368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177262240).

690778368 is an abundant number, since it is smaller than the sum of its proper divisors (1663746112).

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

690778368 is an equidigital number, since it uses as much as digits as its factorization.

690778368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794 (or 4771 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 690778368 is about 26282.6628787876. The cubic root of 690778368 is about 883.9877423687.

The spelling of 690778368 in words is "six hundred ninety million, seven hundred seventy-eight thousand, three hundred sixty-eight".