84740987 has 4 divisors (see below), whose sum is σ = 87663120. Its totient is φ = 81818856.

The previous prime is 84740963. The next prime is 84741001. The reversal of 84740987 is 78904748.

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

It is a cyclic number.

It is not a de Polignac number, because 84740987 - 2⁶ = 84740923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84740287) 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, 1461023 + ... + 1461080.

It is an arithmetic number, because the mean of its divisors is an integer number (21915780).

Almost surely, 2^84740987 is an apocalyptic number.

84740987 is a deficient number, since it is larger than the sum of its proper divisors (2922133).

84740987 is a wasteful number, since it uses less digits than its factorization.

84740987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922132.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 84740987 is about 9205.4867877804. The cubic root of 84740987 is about 439.2359104455.

The spelling of 84740987 in words is "eighty-four million, seven hundred forty thousand, nine hundred eighty-seven".