661151028 has 12 divisors (see below), whose sum is σ = 1542685760. Its totient is φ = 220383672.

The previous prime is 661151017. The next prime is 661151041. The reversal of 661151028 is 820151166.

661151028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 661150986 and 661151004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27547948 + ... + 27547971.

Almost surely, 2^661151028 is an apocalyptic number.

It is an amenable number.

661151028 is an abundant number, since it is smaller than the sum of its proper divisors (881534732).

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

661151028 is a wasteful number, since it uses less digits than its factorization.

661151028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55095926 (or 55095924 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 661151028 is about 25712.8572507996. The cubic root of 661151028 is about 871.1646128582.

The spelling of 661151028 in words is "six hundred sixty-one million, one hundred fifty-one thousand, twenty-eight".