997720044 has 12 divisors (see below), whose sum is σ = 2328013464. Its totient is φ = 332573344.

The previous prime is 997720043. The next prime is 997720049. The reversal of 997720044 is 440027799.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 997719978 and 997720005.

It is not an unprimeable number, because it can be changed into a prime (997720043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41571657 + ... + 41571680.

It is an arithmetic number, because the mean of its divisors is an integer number (194001122).

Almost surely, 2^997720044 is an apocalyptic number.

It is an amenable number.

997720044 is an abundant number, since it is smaller than the sum of its proper divisors (1330293420).

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

997720044 is a wasteful number, since it uses less digits than its factorization.

997720044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83143344 (or 83143342 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 997720044 is about 31586.7067609145. The cubic root of 997720044 is about 999.2394363563.

The spelling of 997720044 in words is "nine hundred ninety-seven million, seven hundred twenty thousand, forty-four".