128494660 has 48 divisors (see below), whose sum is σ = 314697600. Its totient is φ = 44052960.

The previous prime is 128494651. The next prime is 128494661. The reversal of 128494660 is 66494821.

128494660 = 433² + 434² + ... + 775².

It is not an unprimeable number, because it can be changed into a prime (128494661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2506 + ... + 16225.

It is an arithmetic number, because the mean of its divisors is an integer number (6556200).

Almost surely, 2^128494660 is an apocalyptic number.

128494660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128494660 is an abundant number, since it is smaller than the sum of its proper divisors (186202940).

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

128494660 is a wasteful number, since it uses less digits than its factorization.

128494660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18761 (or 18745 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 128494660 is about 11335.5485090048. The cubic root of 128494660 is about 504.6167860328.

The spelling of 128494660 in words is "one hundred twenty-eight million, four hundred ninety-four thousand, six hundred sixty".