97021990 has 64 divisors (see below), whose sum is σ = 195592320. Its totient is φ = 34421760.

The previous prime is 97021957. The next prime is 97021993. The reversal of 97021990 is 9912079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97021993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 580887 + ... + 581053.

It is an arithmetic number, because the mean of its divisors is an integer number (3056130).

Almost surely, 2^97021990 is an apocalyptic number.

97021990 is an abundant number, since it is smaller than the sum of its proper divisors (98570330).

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

97021990 is a wasteful number, since it uses less digits than its factorization.

97021990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 97021990 is about 9849.9741116411. The cubic root of 97021990 is about 459.5048073783.

The spelling of 97021990 in words is "ninety-seven million, twenty-one thousand, nine hundred ninety".