78530646 has 16 divisors (see below), whose sum is σ = 157301424. Its totient is φ = 26136864.

The previous prime is 78530623. The next prime is 78530653. The reversal of 78530646 is 64603587.

It is a super-2 number, since 2×78530646² = 12334124722354632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5605 + ... + 13728.

It is an arithmetic number, because the mean of its divisors is an integer number (9831339).

Almost surely, 2^78530646 is an apocalyptic number.

78530646 is an abundant number, since it is smaller than the sum of its proper divisors (78770778).

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

78530646 is a wasteful number, since it uses less digits than its factorization.

78530646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20015.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 78530646 is about 8861.7518584081. The cubic root of 78530646 is about 428.2325976811.

The spelling of 78530646 in words is "seventy-eight million, five hundred thirty thousand, six hundred forty-six".