692121690 has 96 divisors (see below), whose sum is σ = 1957462416. Its totient is φ = 168652800.

The previous prime is 692121659. The next prime is 692121691. The reversal of 692121690 is 96121296.

It can be written as a sum of positive squares in 8 ways, for example, as 542377521 + 149744169 = 23289^2 + 12237^2 .

It is a super-2 number, since 2×692121690² = 958064867536912200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (692121691) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115242 + ... + 121098.

Almost surely, 2^692121690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 692121690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978731208).

692121690 is an abundant number, since it is smaller than the sum of its proper divisors (1265340726).

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

692121690 is a wasteful number, since it uses less digits than its factorization.

692121690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984 (or 5981 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 692121690 is about 26308.2057540989. The cubic root of 692121690 is about 884.5603868537.

The spelling of 692121690 in words is "six hundred ninety-two million, one hundred twenty-one thousand, six hundred ninety".