78421607 has 8 divisors (see below), whose sum is σ = 90053760. Its totient is φ = 67539960.

The previous prime is 78421601. The next prime is 78421619. The reversal of 78421607 is 70612487.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78421607 - 2⁴ = 78421591 is a prime.

It is a super-2 number, since 2×78421607² = 12299896888924898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78421601) 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, 187403 + ... + 187820.

It is an arithmetic number, because the mean of its divisors is an integer number (11256720).

Almost surely, 2^78421607 is an apocalyptic number.

78421607 is a deficient number, since it is larger than the sum of its proper divisors (11632153).

78421607 is a wasteful number, since it uses less digits than its factorization.

78421607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375253.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 78421607 is about 8855.5974953698. The cubic root of 78421607 is about 428.0343070150.

It can be divided in two parts, 7842 and 1607, that added together give a palindrome (9449).

The spelling of 78421607 in words is "seventy-eight million, four hundred twenty-one thousand, six hundred seven".