78086402 has 4 divisors (see below), whose sum is σ = 117129606. Its totient is φ = 39043200.

The previous prime is 78086383. The next prime is 78086419. The reversal of 78086402 is 20468087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20468087 = 1987 ⋅10301.

It can be written as a sum of positive squares in only one way, i.e., 60855601 + 17230801 = 7801^2 + 4151^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19521599 + ... + 19521602.

Almost surely, 2^78086402 is an apocalyptic number.

78086402 is a deficient number, since it is larger than the sum of its proper divisors (39043204).

78086402 is a wasteful number, since it uses less digits than its factorization.

78086402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39043203.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 78086402 is about 8836.6510624784. The cubic root of 78086402 is about 427.4235733102.

The spelling of 78086402 in words is "seventy-eight million, eighty-six thousand, four hundred two".