690411978 has 16 divisors (see below), whose sum is σ = 1534248960. Its totient is φ = 230137308.

The previous prime is 690411977. The next prime is 690411989. The reversal of 690411978 is 879114096.

It is a happy number.

690411978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×690411978³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (690411977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6392650 + ... + 6392757.

It is an arithmetic number, because the mean of its divisors is an integer number (95890560).

Almost surely, 2^690411978 is an apocalyptic number.

690411978 is an abundant number, since it is smaller than the sum of its proper divisors (843836982).

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

690411978 is a wasteful number, since it uses less digits than its factorization.

690411978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785418 (or 12785412 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 690411978 is about 26275.6917701514. The cubic root of 690411978 is about 883.8314252036.

The spelling of 690411978 in words is "six hundred ninety million, four hundred eleven thousand, nine hundred seventy-eight".