694781388 has 180 divisors, whose sum is σ = 2137794120. Its totient is φ = 196172928.

The previous prime is 694781387. The next prime is 694781411. The reversal of 694781388 is 883187496.

It is a super-2 number, since 2×694781388² = 965442354222413088, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (694781387) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1698528 + ... + 1698936.

It is an arithmetic number, because the mean of its divisors is an integer number (11876634).

Almost surely, 2^694781388 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 694781388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068897060).

694781388 is an abundant number, since it is smaller than the sum of its proper divisors (1443012732).

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

694781388 is a wasteful number, since it uses less digits than its factorization.

694781388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 528 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 694781388 is about 26358.7061139199. The cubic root of 694781388 is about 885.6920068773.

The spelling of 694781388 in words is "six hundred ninety-four million, seven hundred eighty-one thousand, three hundred eighty-eight".