128697408 has 168 divisors, whose sum is σ = 429524160. Its totient is φ = 36080640.

The previous prime is 128697407. The next prime is 128697427. The reversal of 128697408 is 804796821.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (128697403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 237618 + ... + 238158.

Almost surely, 2^128697408 is an apocalyptic number.

128697408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128697408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214762080).

128697408 is an abundant number, since it is smaller than the sum of its proper divisors (300826752).

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

128697408 is a wasteful number, since it uses less digits than its factorization.

128697408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 128697408 is about 11344.4880007870. The cubic root of 128697408 is about 504.8820532965.

The spelling of 128697408 in words is "one hundred twenty-eight million, six hundred ninety-seven thousand, four hundred eight".