690662388 has 96 divisors (see below), whose sum is σ = 1869683200. Its totient is φ = 196608384.

The previous prime is 690662309. The next prime is 690662389. The reversal of 690662388 is 883266096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690662389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124743 + ... + 130161.

Almost surely, 2^690662388 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 690662388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934841600).

690662388 is an abundant number, since it is smaller than the sum of its proper divisors (1179020812).

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

690662388 is a wasteful number, since it uses less digits than its factorization.

690662388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501 (or 5499 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 690662388 is about 26280.4563887312. The cubic root of 690662388 is about 883.9382664724.

The spelling of 690662388 in words is "six hundred ninety million, six hundred sixty-two thousand, three hundred eighty-eight".