87777641 has 4 divisors (see below), whose sum is σ = 100317312. Its totient is φ = 75237972.

The previous prime is 87777629. The next prime is 87777649. The reversal of 87777641 is 14677778.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14677778 = 2 ⋅7338889.

It is a cyclic number.

It is not a de Polignac number, because 87777641 - 2¹⁸ = 87515497 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (87777649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6269825 + ... + 6269838.

It is an arithmetic number, because the mean of its divisors is an integer number (25079328).

Almost surely, 2^87777641 is an apocalyptic number.

It is an amenable number.

87777641 is a deficient number, since it is larger than the sum of its proper divisors (12539671).

87777641 is a wasteful number, since it uses less digits than its factorization.

87777641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12539670.

The product of its digits is 460992, while the sum is 47.

The square root of 87777641 is about 9368.9722488649. The cubic root of 87777641 is about 444.4210642539.

The spelling of 87777641 in words is "eighty-seven million, seven hundred seventy-seven thousand, six hundred forty-one".