87778470 has 64 divisors (see below), whose sum is σ = 228360384. Its totient is φ = 21465600.

The previous prime is 87778399. The next prime is 87778487. The reversal of 87778470 is 7487778.

It is a super-3 number, since 3×87778470³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

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, 66820 + ... + 68120.

It is an arithmetic number, because the mean of its divisors is an integer number (3568131).

Almost surely, 2^87778470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87778470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114180192).

87778470 is an abundant number, since it is smaller than the sum of its proper divisors (140581914).

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

87778470 is a wasteful number, since it uses less digits than its factorization.

87778470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497.

The product of its (nonzero) digits is 614656, while the sum is 48.

The square root of 87778470 is about 9369.0164905394. The cubic root of 87778470 is about 444.4224633342.

The spelling of 87778470 in words is "eighty-seven million, seven hundred seventy-eight thousand, four hundred seventy".