78661094 has 4 divisors (see below), whose sum is σ = 117991644. Its totient is φ = 39330546.

The previous prime is 78661087. The next prime is 78661103. The reversal of 78661094 is 49016687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49016687 = 5099 ⋅9613.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19665272 + ... + 19665275.

It is an arithmetic number, because the mean of its divisors is an integer number (29497911).

Almost surely, 2^78661094 is an apocalyptic number.

78661094 is a deficient number, since it is larger than the sum of its proper divisors (39330550).

78661094 is a wasteful number, since it uses less digits than its factorization.

78661094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39330549.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 78661094 is about 8869.1089744123. The cubic root of 78661094 is about 428.4695802531.

The spelling of 78661094 in words is "seventy-eight million, six hundred sixty-one thousand, ninety-four".