78417916 has 6 divisors (see below), whose sum is σ = 137231360. Its totient is φ = 39208956.

The previous prime is 78417907. The next prime is 78417919. The reversal of 78417916 is 61971487.

It is a super-2 number, since 2×78417916² = 12298739099566112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78417919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9802236 + ... + 9802243.

Almost surely, 2^78417916 is an apocalyptic number.

It is an amenable number.

78417916 is a deficient number, since it is larger than the sum of its proper divisors (58813444).

78417916 is a wasteful number, since it uses less digits than its factorization.

78417916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19604483 (or 19604481 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 78417916 is about 8855.3890936536. The cubic root of 78417916 is about 428.0275916064.

The spelling of 78417916 in words is "seventy-eight million, four hundred seventeen thousand, nine hundred sixteen".