661329048 has 32 divisors (see below), whose sum is σ = 1740340800.
Its totient is φ = 208840608.
The previous prime is 661328989. The next prime is 661329049. The reversal of 661329048 is 840923166.
It is a super-2 number, since 2×6613290482 = 874712219457172608, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 661328997 and 661329015.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (661329049) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724686 + ... + 725597.
It is an arithmetic number, because the mean of its divisors is an integer number (54385650).
Almost surely, 2661329048 is an apocalyptic number.
It is an amenable number.
661329048 is an abundant number, since it is smaller than the sum of its proper divisors (1079011752).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
661329048 is a wasteful number, since it uses less digits than its factorization.
661329048 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1450311 (or 1450307 counting only the distinct ones).
The product of its (nonzero) digits is 62208, while the sum is 39.
The square root of 661329048 is about 25716.3187101109.
The cubic root of 661329048 is about 871.2427950993.
The spelling of 661329048 in words is "six hundred sixty-one million, three hundred twenty-nine thousand, forty-eight".