78465780 has 48 divisors (see below), whose sum is σ = 244117440. Its totient is φ = 20924064.

The previous prime is 78465769. The next prime is 78465809. The reversal of 78465780 is 8756487.

78465780 is a `hidden beast` number, since 78 + 4 + 6 + 578 + 0 = 666.

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

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, 72114 + ... + 73193.

It is an arithmetic number, because the mean of its divisors is an integer number (5085780).

Almost surely, 2^78465780 is an apocalyptic number.

It is an amenable number.

78465780 is an abundant number, since it is smaller than the sum of its proper divisors (165651660).

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

78465780 is a wasteful number, since it uses less digits than its factorization.

78465780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145325 (or 145317 counting only the distinct ones).

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

The square root of 78465780 is about 8858.0912165093. The cubic root of 78465780 is about 428.1146590643.

It can be divided in two parts, 784 and 65780, that added together give a square (66564 = 258²).

The spelling of 78465780 in words is "seventy-eight million, four hundred sixty-five thousand, seven hundred eighty".