87239970 has 64 divisors (see below), whose sum is σ = 234973440. Its totient is φ = 23030784.

The previous prime is 87239951. The next prime is 87239987. The reversal of 87239970 is 7993278.

It is a super-2 number, since 2×87239970² = 15221624731201800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26242 + ... + 29378.

It is an arithmetic number, because the mean of its divisors is an integer number (3671460).

Almost surely, 2^87239970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87239970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117486720).

87239970 is an abundant number, since it is smaller than the sum of its proper divisors (147733470).

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

87239970 is a wasteful number, since it uses less digits than its factorization.

87239970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 3250 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 87239970 is about 9340.2339371131. The cubic root of 87239970 is about 443.5117898901.

It can be divided in two parts, 87239 and 970, that added together give a square (88209 = 297²).

The spelling of 87239970 in words is "eighty-seven million, two hundred thirty-nine thousand, nine hundred seventy".