690978073394 has 16 divisors (see below), whose sum is σ = 1189490054400. Its totient is φ = 294894406464.

The previous prime is 690978073369. The next prime is 690978073397. The reversal of 690978073394 is 493370879096.

It is a super-2 number, since 2×690978073394² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690978073394.

It is not an unprimeable number, because it can be changed into a prime (690978073397) 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, 103250999 + ... + 103257690.

It is an arithmetic number, because the mean of its divisors is an integer number (74343128400).

Almost surely, 2^690978073394 is an apocalyptic number.

690978073394 is a deficient number, since it is larger than the sum of its proper divisors (498511981006).

690978073394 is a wasteful number, since it uses less digits than its factorization.

690978073394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206508937.

The product of its (nonzero) digits is 61725888, while the sum is 65.

The spelling of 690978073394 in words is "six hundred ninety billion, nine hundred seventy-eight million, seventy-three thousand, three hundred ninety-four".