690651380 has 48 divisors (see below), whose sum is σ = 1488896640. Its totient is φ = 268963968.

The previous prime is 690651341. The next prime is 690651389. The reversal of 690651380 is 83156096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690651389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307622 + ... + 309858.

It is an arithmetic number, because the mean of its divisors is an integer number (31018680).

Almost surely, 2^690651380 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 690651380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744448320).

690651380 is an abundant number, since it is smaller than the sum of its proper divisors (798245260).

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

690651380 is a wasteful number, since it uses less digits than its factorization.

690651380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 2646 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 690651380 is about 26280.2469546996. The cubic root of 690651380 is about 883.9335702830.

The spelling of 690651380 in words is "six hundred ninety million, six hundred fifty-one thousand, three hundred eighty".