690748021778 has 16 divisors (see below), whose sum is σ = 1084379063040. Its totient is φ = 329377452096.

The previous prime is 690748021771. The next prime is 690748021811. The reversal of 690748021778 is 877120847096.

It is not an unprimeable number, because it can be changed into a prime (690748021771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22263818 + ... + 22294821.

It is an arithmetic number, because the mean of its divisors is an integer number (67773691440).

Almost surely, 2^690748021778 is an apocalyptic number.

690748021778 is a deficient number, since it is larger than the sum of its proper divisors (393631041262).

690748021778 is a wasteful number, since it uses less digits than its factorization.

690748021778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44559001.

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 690748021778 in words is "six hundred ninety billion, seven hundred forty-eight million, twenty-one thousand, seven hundred seventy-eight".