87490778 has 4 divisors (see below), whose sum is σ = 131236170. Its totient is φ = 43745388.

The previous prime is 87490769. The next prime is 87490807. The reversal of 87490778 is 87709478.

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

It can be written as a sum of positive squares in only one way, i.e., 60730849 + 26759929 = 7793^2 + 5173^2 .

It is a super-3 number, since 3×87490778³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21872693 + ... + 21872696.

Almost surely, 2^87490778 is an apocalyptic number.

87490778 is a deficient number, since it is larger than the sum of its proper divisors (43745392).

87490778 is a wasteful number, since it uses less digits than its factorization.

87490778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43745391.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 87490778 is about 9353.6505173114. The cubic root of 87490778 is about 443.9364036553.

The spelling of 87490778 in words is "eighty-seven million, four hundred ninety thousand, seven hundred seventy-eight".