78455580 has 48 divisors (see below), whose sum is σ = 251059200. Its totient is φ = 17932608.

The previous prime is 78455557. The next prime is 78455603. The reversal of 78455580 is 8555487.

It is an interprime number because it is at equal distance from previous prime (78455557) and next prime (78455603).

It is a super-3 number, since 3×78455580³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 92980 + ... + 93819.

It is an arithmetic number, because the mean of its divisors is an integer number (5230400).

Almost surely, 2^78455580 is an apocalyptic number.

78455580 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78455580 is an abundant number, since it is smaller than the sum of its proper divisors (172603620).

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

78455580 is a wasteful number, since it uses less digits than its factorization.

78455580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186818 (or 186816 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 42.

The square root of 78455580 is about 8857.5154529924. The cubic root of 78455580 is about 428.0961076281.

The spelling of 78455580 in words is "seventy-eight million, four hundred fifty-five thousand, five hundred eighty".