78320619 has 48 divisors (see below), whose sum is σ = 129336480. Its totient is φ = 45319680.

The previous prime is 78320609. The next prime is 78320633. The reversal of 78320619 is 91602387.

78320619 is a `hidden beast` number, since 7 + 8 + 32 + 0 + 619 = 666.

It is not a de Polignac number, because 78320619 - 2²¹ = 76223467 is a prime.

It is a super-2 number, since 2×78320619² = 12268238721086322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78320609) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138832 + ... + 139394.

It is an arithmetic number, because the mean of its divisors is an integer number (2694510).

Almost surely, 2^78320619 is an apocalyptic number.

78320619 is a deficient number, since it is larger than the sum of its proper divisors (51015861).

78320619 is a wasteful number, since it uses less digits than its factorization.

78320619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 78320619 is about 8849.8937281755. The cubic root of 78320619 is about 427.8504933165.

It can be divided in two parts, 783206 and 19, that added together give a square (783225 = 885²).

The spelling of 78320619 in words is "seventy-eight million, three hundred twenty thousand, six hundred nineteen".