88691138 has 4 divisors (see below), whose sum is σ = 133036710. Its totient is φ = 44345568.

The previous prime is 88691129. The next prime is 88691147. The reversal of 88691138 is 83119688.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (88691129) and next prime (88691147).

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 1399489 = 9343^2 + 1183^2 .

It is a super-2 number, since 2×88691138² = 15732235919470088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22172783 + ... + 22172786.

Almost surely, 2^88691138 is an apocalyptic number.

88691138 is a deficient number, since it is larger than the sum of its proper divisors (44345572).

88691138 is a wasteful number, since it uses less digits than its factorization.

88691138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44345571.

The product of its digits is 82944, while the sum is 44.

The square root of 88691138 is about 9417.5972519534. The cubic root of 88691138 is about 445.9574352590.

The spelling of 88691138 in words is "eighty-eight million, six hundred ninety-one thousand, one hundred thirty-eight".