78218074 has 32 divisors (see below), whose sum is σ = 132302016. Its totient is φ = 34369920.

The previous prime is 78218069. The next prime is 78218081. The reversal of 78218074 is 47081287.

It is a super-2 number, since 2×78218074² = 12236134200538952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249742 + ... + 250054.

It is an arithmetic number, because the mean of its divisors is an integer number (4134438).

Almost surely, 2^78218074 is an apocalyptic number.

78218074 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78218074 is a deficient number, since it is larger than the sum of its proper divisors (54083942).

78218074 is a wasteful number, since it uses less digits than its factorization.

78218074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 78218074 is about 8844.0982581606. The cubic root of 78218074 is about 427.6636838856.

The spelling of 78218074 in words is "seventy-eight million, two hundred eighteen thousand, seventy-four".