97801840 has 20 divisors (see below), whose sum is σ = 227389464. Its totient is φ = 39120704.

The previous prime is 97801817. The next prime is 97801853. The reversal of 97801840 is 4810879.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 97801840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611182 + ... + 611341.

Almost surely, 2^97801840 is an apocalyptic number.

It is an amenable number.

97801840 is an abundant number, since it is smaller than the sum of its proper divisors (129587624).

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

97801840 is a wasteful number, since it uses less digits than its factorization.

97801840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222536 (or 1222530 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 97801840 is about 9889.4812806335. The cubic root of 97801840 is about 460.7326698419.

The spelling of 97801840 in words is "ninety-seven million, eight hundred one thousand, eight hundred forty".