87191948 has 6 divisors (see below), whose sum is σ = 152585916. Its totient is φ = 43595972.

The previous prime is 87191947. The next prime is 87191959. The reversal of 87191948 is 84919178.

It is not an unprimeable number, because it can be changed into a prime (87191947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898990 + ... + 10898997.

It is an arithmetic number, because the mean of its divisors is an integer number (25430986).

Almost surely, 2^87191948 is an apocalyptic number.

It is an amenable number.

87191948 is a deficient number, since it is larger than the sum of its proper divisors (65393968).

87191948 is a wasteful number, since it uses less digits than its factorization.

87191948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21797991 (or 21797989 counting only the distinct ones).

The product of its digits is 145152, while the sum is 47.

The square root of 87191948 is about 9337.6628767588. The cubic root of 87191948 is about 443.4303966468.

The spelling of 87191948 in words is "eighty-seven million, one hundred ninety-one thousand, nine hundred forty-eight".