87780998 has 4 divisors (see below), whose sum is σ = 131671500. Its totient is φ = 43890498.

The previous prime is 87780997. The next prime is 87781039. The reversal of 87780998 is 89908778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89908778 = 2 ⋅44954389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87780991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21945248 + ... + 21945251.

It is an arithmetic number, because the mean of its divisors is an integer number (32917875).

Almost surely, 2^87780998 is an apocalyptic number.

87780998 is a deficient number, since it is larger than the sum of its proper divisors (43890502).

87780998 is a wasteful number, since it uses less digits than its factorization.

87780998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43890501.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The square root of 87780998 is about 9369.1514023416. The cubic root of 87780998 is about 444.4267297152.

The spelling of 87780998 in words is "eighty-seven million, seven hundred eighty thousand, nine hundred ninety-eight".