781142216 has 64 divisors (see below), whose sum is σ = 1546836480. Its totient is φ = 369354240.

The previous prime is 781142203. The next prime is 781142239. The reversal of 781142216 is 612241187.

It is a happy number.

It is a super-2 number, since 2×781142216² = 1220366323234781312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2819870 + ... + 2820146.

It is an arithmetic number, because the mean of its divisors is an integer number (24169320).

Almost surely, 2^781142216 is an apocalyptic number.

It is an amenable number.

781142216 is a deficient number, since it is larger than the sum of its proper divisors (765694264).

781142216 is a wasteful number, since it uses less digits than its factorization.

781142216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 530 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 781142216 is about 27948.9215534339. The cubic root of 781142216 is about 920.9655175493.

The spelling of 781142216 in words is "seven hundred eighty-one million, one hundred forty-two thousand, two hundred sixteen".