87019749 has 24 divisors (see below), whose sum is σ = 132256800. Its totient is φ = 55053600.

The previous prime is 87019747. The next prime is 87019789. The reversal of 87019749 is 94791078.

It is not a de Polignac number, because 87019749 - 2¹ = 87019747 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87019747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12574 + ... + 18224.

It is an arithmetic number, because the mean of its divisors is an integer number (5510700).

Almost surely, 2^87019749 is an apocalyptic number.

It is an amenable number.

87019749 is a deficient number, since it is larger than the sum of its proper divisors (45237051).

87019749 is a wasteful number, since it uses less digits than its factorization.

87019749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745 (or 5742 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 87019749 is about 9328.4376505393. The cubic root of 87019749 is about 443.1382878930.

The spelling of 87019749 in words is "eighty-seven million, nineteen thousand, seven hundred forty-nine".