781012378 has 8 divisors (see below), whose sum is σ = 1183596372. Its totient is φ = 386480256.

The previous prime is 781012361. The next prime is 781012439. The reversal of 781012378 is 873210187.

It can be written as a sum of positive squares in 2 ways, for example, as 716258169 + 64754209 = 26763^2 + 8047^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012725 + ... + 2013112.

Almost surely, 2^781012378 is an apocalyptic number.

781012378 is a deficient number, since it is larger than the sum of its proper divisors (402583994).

781012378 is a wasteful number, since it uses less digits than its factorization.

781012378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025936.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 781012378 is about 27946.5986839186. The cubic root of 781012378 is about 920.9144884520.

The spelling of 781012378 in words is "seven hundred eighty-one million, twelve thousand, three hundred seventy-eight".