78214973 has 8 divisors (see below), whose sum is σ = 81710208. Its totient is φ = 74727664.

The previous prime is 78214933. The next prime is 78215023. The reversal of 78214973 is 37941287.

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

It is a 5-Lehmer number, since φ(78214973) divides (78214973-1)⁵.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78214973 is a prime.

It is a super-2 number, since 2×78214973² = 12235164002781458, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78214973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78214933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28040 + ... + 30702.

It is an arithmetic number, because the mean of its divisors is an integer number (10213776).

Almost surely, 2^78214973 is an apocalyptic number.

It is an amenable number.

78214973 is a deficient number, since it is larger than the sum of its proper divisors (3495235).

78214973 is a wasteful number, since it uses less digits than its factorization.

78214973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963.

The product of its digits is 84672, while the sum is 41.

The square root of 78214973 is about 8843.9229417719. The cubic root of 78214973 is about 427.6580321543.

The spelling of 78214973 in words is "seventy-eight million, two hundred fourteen thousand, nine hundred seventy-three".