78784650 has 180 divisors, whose sum is σ = 255285558. Its totient is φ = 17962560.

The previous prime is 78784627. The next prime is 78784691. The reversal of 78784650 is 5648787.

It can be written as a sum of positive squares in 3 ways, for example, as 64016001 + 14768649 = 8001^2 + 3843^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78784596 and 78784605.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 198252 + ... + 198648.

Almost surely, 2^78784650 is an apocalyptic number.

78784650 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78784650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127642779).

78784650 is an abundant number, since it is smaller than the sum of its proper divisors (176500908).

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

78784650 is a wasteful number, since it uses less digits than its factorization.

78784650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 78784650 is about 8876.0717662714. The cubic root of 78784650 is about 428.6938007694.

The spelling of 78784650 in words is "seventy-eight million, seven hundred eighty-four thousand, six hundred fifty".