78414464 has 16 divisors (see below), whose sum is σ = 156216570. Its totient is φ = 39207168.

The previous prime is 78414443. The next prime is 78414467. The reversal of 78414464 is 46441487.

It can be written as a sum of positive squares in only one way, i.e., 42510400 + 35904064 = 6520^2 + 5992^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×78414464² = 12297656328814592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78414467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306179 + ... + 306434.

Almost surely, 2^78414464 is an apocalyptic number.

It is an amenable number.

78414464 is a deficient number, since it is larger than the sum of its proper divisors (77802106).

78414464 is an equidigital number, since it uses as much as digits as its factorization.

78414464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612627 (or 612615 counting only the distinct ones).

The product of its digits is 86016, while the sum is 38.

The square root of 78414464 is about 8855.1941819477. The cubic root of 78414464 is about 428.0213108438.

The spelling of 78414464 in words is "seventy-eight million, four hundred fourteen thousand, four hundred sixty-four".