699687378 has 60 divisors (see below), whose sum is σ = 1643524038. Its totient is φ = 215130240.

The previous prime is 699687371. The next prime is 699687403. The reversal of 699687378 is 873786996.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 202977009 + 496710369 = 14247^2 + 22287^2 .

It is not an unprimeable number, because it can be changed into a prime (699687371) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 513418 + ... + 514778.

Almost surely, 2^699687378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 699687378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821762019).

699687378 is an abundant number, since it is smaller than the sum of its proper divisors (943836660).

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

699687378 is a wasteful number, since it uses less digits than its factorization.

699687378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1379 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The square root of 699687378 is about 26451.6044503920. The cubic root of 699687378 is about 887.7718019057.

The spelling of 699687378 in words is "six hundred ninety-nine million, six hundred eighty-seven thousand, three hundred seventy-eight".