87723120 has 40 divisors (see below), whose sum is σ = 271942416. Its totient is φ = 23392768.

The previous prime is 87723113. The next prime is 87723121. The reversal of 87723120 is 2132778.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87723121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182517 + ... + 182996.

Almost surely, 2^87723120 is an apocalyptic number.

87723120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87723120 is an abundant number, since it is smaller than the sum of its proper divisors (184219296).

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

87723120 is a wasteful number, since it uses less digits than its factorization.

87723120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365529 (or 365523 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 87723120 is about 9366.0621394479. The cubic root of 87723120 is about 444.3290313285.

Adding to 87723120 its reverse (2132778), we get a palindrome (89855898).

The spelling of 87723120 in words is "eighty-seven million, seven hundred twenty-three thousand, one hundred twenty".