87240240 has 100 divisors (see below), whose sum is σ = 303020784. Its totient is φ = 23262336.

The previous prime is 87240239. The next prime is 87240247. The reversal of 87240240 is 4204278.

It is a super-2 number, since 2×87240240² = 15221718950515200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (87240247) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 252 + ... + 13211.

Almost surely, 2^87240240 is an apocalyptic number.

87240240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151510392).

87240240 is an abundant number, since it is smaller than the sum of its proper divisors (215780544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87240240 is a wasteful number, since it uses less digits than its factorization.

87240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13488 (or 13473 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 87240240 is about 9340.2483907014. The cubic root of 87240240 is about 443.5122474329.

The spelling of 87240240 in words is "eighty-seven million, two hundred forty thousand, two hundred forty".