78387478 has 8 divisors (see below), whose sum is σ = 126625968. Its totient is φ = 36178824.

The previous prime is 78387469. The next prime is 78387481. The reversal of 78387478 is 87478387.

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

It is a super-2 number, since 2×78387478² = 12289193414400968, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507426 + ... + 1507477.

It is an arithmetic number, because the mean of its divisors is an integer number (15828246).

Almost surely, 2^78387478 is an apocalyptic number.

78387478 is a deficient number, since it is larger than the sum of its proper divisors (48238490).

78387478 is a wasteful number, since it uses less digits than its factorization.

78387478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014918.

The product of its digits is 2107392, while the sum is 52.

The square root of 78387478 is about 8853.6703123620. The cubic root of 78387478 is about 427.9722046467.

Subtracting 78387478 from its reverse (87478387), we obtain a palindrome (9090909).

The spelling of 78387478 in words is "seventy-eight million, three hundred eighty-seven thousand, four hundred seventy-eight".