78501552 has 80 divisors (see below), whose sum is σ = 210174048. Its totient is φ = 25231360.

The previous prime is 78501551. The next prime is 78501581. The reversal of 78501552 is 25510587.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78501551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222208 + ... + 222560.

Almost surely, 2^78501552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78501552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105087024).

78501552 is an abundant number, since it is smaller than the sum of its proper divisors (131672496).

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

78501552 is a wasteful number, since it uses less digits than its factorization.

78501552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 78501552 is about 8860.1101573287. The cubic root of 78501552 is about 428.1797073394.

The spelling of 78501552 in words is "seventy-eight million, five hundred one thousand, five hundred fifty-two".