78399485 has 8 divisors (see below), whose sum is σ = 96622296. Its totient is φ = 61024320.

The previous prime is 78399473. The next prime is 78399547. The reversal of 78399485 is 58499387.

It can be written as a sum of positive squares in 4 ways, for example, as 23609881 + 54789604 = 4859^2 + 7402^2 .

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

It is not a de Polignac number, because 78399485 - 2⁸ = 78399229 is a prime.

It is a super-2 number, since 2×78399485² = 12292958496530450, which contains 22 as substring.

It is a Duffinian number.

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, 211706 + ... + 212075.

It is an arithmetic number, because the mean of its divisors is an integer number (12077787).

Almost surely, 2^78399485 is an apocalyptic number.

It is an amenable number.

78399485 is a deficient number, since it is larger than the sum of its proper divisors (18222811).

78399485 is a wasteful number, since it uses less digits than its factorization.

78399485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423823.

The product of its digits is 2177280, while the sum is 53.

The square root of 78399485 is about 8854.3483667631. The cubic root of 78399485 is about 427.9940550751.

It can be divided in two parts, 7839 and 9485, that multiplied together give a triangular number (74352915 = T₁₂₁₉₄).

The spelling of 78399485 in words is "seventy-eight million, three hundred ninety-nine thousand, four hundred eighty-five".