88491649 has 9 divisors (see below), whose sum is σ = 92733123. Its totient is φ = 84437232.

The previous prime is 88491643. The next prime is 88491659. The reversal of 88491649 is 94619488.

The square root of 88491649 is 9407.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 80874049 + 7617600 = 8993^2 + 2760^2 .

It is not a de Polignac number, because 88491649 - 2⁷ = 88491521 is a prime.

It is a Duffinian number.

Its product of digits (497664) is a multiple of the sum of its prime divisors (432).

It is not an unprimeable number, because it can be changed into a prime (88491643) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 216157 + ... + 216565.

Almost surely, 2^88491649 is an apocalyptic number.

88491649 is the 9407-th square number.

88491649 is the 4704-th centered octagonal number.

It is an amenable number.

88491649 is a deficient number, since it is larger than the sum of its proper divisors (4241474).

88491649 is an frugal number, since it uses more digits than its factorization.

88491649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 432 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The cubic root of 88491649 is about 445.6228269058.

Multiplying 88491649 by its sum of digits (49), we get a square (4336090801 = 65849²).

The spelling of 88491649 in words is "eighty-eight million, four hundred ninety-one thousand, six hundred forty-nine".