87781407 has 8 divisors (see below), whose sum is σ = 133762176. Its totient is φ = 50160792.

The previous prime is 87781391. The next prime is 87781417. The reversal of 87781407 is 70418778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87781407 - 2⁴ = 87781391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87781417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2090013 + ... + 2090054.

It is an arithmetic number, because the mean of its divisors is an integer number (16720272).

Almost surely, 2^87781407 is an apocalyptic number.

87781407 is a deficient number, since it is larger than the sum of its proper divisors (45980769).

87781407 is a wasteful number, since it uses less digits than its factorization.

87781407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180077.

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 87781407 is about 9369.1732292663. The cubic root of 87781407 is about 444.4274199567.

It can be divided in two parts, 87781 and 407, that added together give a palindrome (88188).

The spelling of 87781407 in words is "eighty-seven million, seven hundred eighty-one thousand, four hundred seven".