128992494 has 32 divisors (see below), whose sum is σ = 260820000. Its totient is φ = 42528384.

The previous prime is 128992489. The next prime is 128992499. The reversal of 128992494 is 494299821.

It is an interprime number because it is at equal distance from previous prime (128992489) and next prime (128992499).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128992499) 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, 369432 + ... + 369780.

It is an arithmetic number, because the mean of its divisors is an integer number (8150625).

Almost surely, 2^128992494 is an apocalyptic number.

128992494 is an abundant number, since it is smaller than the sum of its proper divisors (131827506).

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

128992494 is a wasteful number, since it uses less digits than its factorization.

128992494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its digits is 373248, while the sum is 48.

The square root of 128992494 is about 11357.4862535686. The cubic root of 128992494 is about 505.2676344987.

The spelling of 128992494 in words is "one hundred twenty-eight million, nine hundred ninety-two thousand, four hundred ninety-four".