78231478 has 16 divisors (see below), whose sum is σ = 128262960. Its totient is φ = 35567136.

The previous prime is 78231451. The next prime is 78231481. The reversal of 78231478 is 87413287.

It is a super-2 number, since 2×78231478² = 12240328300128968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78231478.

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, 20713 + ... + 24196.

It is an arithmetic number, because the mean of its divisors is an integer number (8016435).

Almost surely, 2^78231478 is an apocalyptic number.

78231478 is a deficient number, since it is larger than the sum of its proper divisors (50031482).

78231478 is a wasteful number, since it uses less digits than its factorization.

78231478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44991.

The product of its digits is 75264, while the sum is 40.

The square root of 78231478 is about 8844.8560191786. The cubic root of 78231478 is about 427.6881116438.

The spelling of 78231478 in words is "seventy-eight million, two hundred thirty-one thousand, four hundred seventy-eight".