78236530 has 8 divisors (see below), whose sum is σ = 140825772. Its totient is φ = 31294608.

The previous prime is 78236513. The next prime is 78236531. The reversal of 78236530 is 3563287.

It can be written as a sum of positive squares in 2 ways, for example, as 77316849 + 919681 = 8793^2 + 959^2 .

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

It is a super-2 number, since 2×78236530² = 12241909252881800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78236531) 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, 3911817 + ... + 3911836.

Almost surely, 2^78236530 is an apocalyptic number.

78236530 is a deficient number, since it is larger than the sum of its proper divisors (62589242).

78236530 is a wasteful number, since it uses less digits than its factorization.

78236530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7823660.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 78236530 is about 8845.1416042933. The cubic root of 78236530 is about 427.6973178009.

The spelling of 78236530 in words is "seventy-eight million, two hundred thirty-six thousand, five hundred thirty".