88721775 has 18 divisors (see below), whose sum is σ = 158910960. Its totient is φ = 47318160.

The previous prime is 88721761. The next prime is 88721777. The reversal of 88721775 is 57712788.

It is not a de Polignac number, because 88721775 - 2²³ = 80333167 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 88721775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88721777) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 196935 + ... + 197384.

Almost surely, 2^88721775 is an apocalyptic number.

88721775 is a deficient number, since it is larger than the sum of its proper divisors (70189185).

88721775 is a wasteful number, since it uses less digits than its factorization.

88721775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394335 (or 394327 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 88721775 is about 9419.2236941268. The cubic root of 88721775 is about 446.0087790774.

The spelling of 88721775 in words is "eighty-eight million, seven hundred twenty-one thousand, seven hundred seventy-five".