78302530 has 16 divisors (see below), whose sum is σ = 141087744. Its totient is φ = 31289200.

The previous prime is 78302519. The next prime is 78302531. The reversal of 78302530 is 3520387.

It is a super-2 number, since 2×78302530² = 12262572408801800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78302531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8109 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (8817984).

Almost surely, 2^78302530 is an apocalyptic number.

78302530 is a deficient number, since it is larger than the sum of its proper divisors (62785214).

78302530 is a wasteful number, since it uses less digits than its factorization.

78302530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 78302530 is about 8848.8716794855. The cubic root of 78302530 is about 427.8175518698.

The spelling of 78302530 in words is "seventy-eight million, three hundred two thousand, five hundred thirty".