87720370 has 8 divisors (see below), whose sum is σ = 157896684. Its totient is φ = 35088144.

The previous prime is 87720343. The next prime is 87720371. The reversal of 87720370 is 7302778.

It can be written as a sum of positive squares in 2 ways, for example, as 86099841 + 1620529 = 9279^2 + 1273^2 .

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

It is not an unprimeable number, because it can be changed into a prime (87720371) 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, 4386009 + ... + 4386028.

Almost surely, 2^87720370 is an apocalyptic number.

87720370 is a deficient number, since it is larger than the sum of its proper divisors (70176314).

87720370 is a wasteful number, since it uses less digits than its factorization.

87720370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8772044.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 87720370 is about 9365.9153316694. The cubic root of 87720370 is about 444.3243882439.

The spelling of 87720370 in words is "eighty-seven million, seven hundred twenty thousand, three hundred seventy".