781972966 has 4 divisors (see below), whose sum is σ = 1172959452. Its totient is φ = 390986482.

The previous prime is 781972943. The next prime is 781972967. The reversal of 781972966 is 669279187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669279187 = 2297 ⋅291371.

It is a super-2 number, since 2×781972966² = 1222963439109674312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781972967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195493240 + ... + 195493243.

It is an arithmetic number, because the mean of its divisors is an integer number (293239863).

Almost surely, 2^781972966 is an apocalyptic number.

781972966 is a deficient number, since it is larger than the sum of its proper divisors (390986486).

781972966 is a wasteful number, since it uses less digits than its factorization.

781972966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390986485.

The product of its digits is 2286144, while the sum is 55.

The square root of 781972966 is about 27963.7795371084. The cubic root of 781972966 is about 921.2918862188.

The spelling of 781972966 in words is "seven hundred eighty-one million, nine hundred seventy-two thousand, nine hundred sixty-six".