665073972 has 36 divisors (see below), whose sum is σ = 1708724836. Its totient is φ = 218056320.

The previous prime is 665073931. The next prime is 665073973. The reversal of 665073972 is 279370566.

It can be written as a sum of positive squares in 2 ways, for example, as 132572196 + 532501776 = 11514^2 + 23076^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×665073972³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665073973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149233 + ... + 153624.

Almost surely, 2^665073972 is an apocalyptic number.

It is an amenable number.

665073972 is an abundant number, since it is smaller than the sum of its proper divisors (1043650864).

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

665073972 is a wasteful number, since it uses less digits than its factorization.

665073972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302928 (or 302923 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The square root of 665073972 is about 25789.0281321340. The cubic root of 665073972 is about 872.8842365286.

The spelling of 665073972 in words is "six hundred sixty-five million, seventy-three thousand, nine hundred seventy-two".