690121970 has 32 divisors (see below), whose sum is σ = 1322697600. Its totient is φ = 258347776.

The previous prime is 690121871. The next prime is 690121981. The reversal of 690121970 is 79121096.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 690121970.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19091 + ... + 41769.

It is an arithmetic number, because the mean of its divisors is an integer number (41334300).

Almost surely, 2^690121970 is an apocalyptic number.

690121970 is a deficient number, since it is larger than the sum of its proper divisors (632575630).

690121970 is a wasteful number, since it uses less digits than its factorization.

690121970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22882.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 690121970 is about 26270.1726298096. The cubic root of 690121970 is about 883.7076565508.

The spelling of 690121970 in words is "six hundred ninety million, one hundred twenty-one thousand, nine hundred seventy".