87389478 has 24 divisors (see below), whose sum is σ = 206557416. Its totient is φ = 26481600.

The previous prime is 87389473. The next prime is 87389479. The reversal of 87389478 is 87498378.

It is a super-2 number, since 2×87389478² = 15273841730224968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87389473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220483 + ... + 220878.

It is an arithmetic number, because the mean of its divisors is an integer number (8606559).

Almost surely, 2^87389478 is an apocalyptic number.

87389478 is an abundant number, since it is smaller than the sum of its proper divisors (119167938).

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

87389478 is a wasteful number, since it uses less digits than its factorization.

87389478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441380 (or 441377 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 87389478 is about 9348.2339508594. The cubic root of 87389478 is about 443.7650022568.

Subtracting 87389478 from its reverse (87498378), we obtain a square (108900 = 330²).

The spelling of 87389478 in words is "eighty-seven million, three hundred eighty-nine thousand, four hundred seventy-eight".