128498816 has 16 divisors (see below), whose sum is σ = 255993990. Its totient is φ = 64249344.

The previous prime is 128498809. The next prime is 128498819. The reversal of 128498816 is 618894821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 50353216 = 8840^2 + 7096^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (128498819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501821 + ... + 502076.

Almost surely, 2^128498816 is an apocalyptic number.

128498816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128498816 is a deficient number, since it is larger than the sum of its proper divisors (127495174).

128498816 is an equidigital number, since it uses as much as digits as its factorization.

128498816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003911 (or 1003899 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 128498816 is about 11335.7318246331. The cubic root of 128498816 is about 504.6222263750.

The spelling of 128498816 in words is "one hundred twenty-eight million, four hundred ninety-eight thousand, eight hundred sixteen".