88781391 has 6 divisors (see below), whose sum is σ = 128239800. Its totient is φ = 59187588.

The previous prime is 88781387. The next prime is 88781393. The reversal of 88781391 is 19318788.

It is not a de Polignac number, because 88781391 - 2² = 88781387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88781393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4932291 + ... + 4932308.

It is an arithmetic number, because the mean of its divisors is an integer number (21373300).

Almost surely, 2^88781391 is an apocalyptic number.

88781391 is a deficient number, since it is larger than the sum of its proper divisors (39458409).

88781391 is a wasteful number, since it uses less digits than its factorization.

88781391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9864605 (or 9864602 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 88781391 is about 9422.3877547042. The cubic root of 88781391 is about 446.1086542437.

The spelling of 88781391 in words is "eighty-eight million, seven hundred eighty-one thousand, three hundred ninety-one".