78282776 has 64 divisors (see below), whose sum is σ = 176752800. Its totient is φ = 32025600.

The previous prime is 78282767. The next prime is 78282797. The reversal of 78282776 is 67728287.

It is a happy number.

It is a super-2 number, since 2×78282776² = 12256386036532352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78282776.

It is a congruent number.

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, 46070 + ... + 47738.

Almost surely, 2^78282776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78282776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88376400).

78282776 is an abundant number, since it is smaller than the sum of its proper divisors (98470024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78282776 is a wasteful number, since it uses less digits than its factorization.

78282776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 1736 counting only the distinct ones).

The product of its digits is 526848, while the sum is 47.

The square root of 78282776 is about 8847.7554215744. The cubic root of 78282776 is about 427.7815725356.

It can be divided in two parts, 7828 and 2776, that multiplied together give a triangular number (21730528 = T₆₅₉₂).

The spelling of 78282776 in words is "seventy-eight million, two hundred eighty-two thousand, seven hundred seventy-six".