87139498 has 8 divisors (see below), whose sum is σ = 131866308. Its totient is φ = 43184064.

The previous prime is 87139489. The next prime is 87139499. The reversal of 87139498 is 89493178.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71115489 + 16024009 = 8433^2 + 4003^2 .

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

It is a super-2 number, since 2×87139498² = 15186584223384008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87139499) 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, 192561 + ... + 193012.

Almost surely, 2^87139498 is an apocalyptic number.

87139498 is a deficient number, since it is larger than the sum of its proper divisors (44726810).

87139498 is a wasteful number, since it uses less digits than its factorization.

87139498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385688.

The product of its digits is 435456, while the sum is 49.

The square root of 87139498 is about 9334.8539356543. The cubic root of 87139498 is about 443.3414641633.

The spelling of 87139498 in words is "eighty-seven million, one hundred thirty-nine thousand, four hundred ninety-eight".