78249570 has 48 divisors (see below), whose sum is σ = 218464128. Its totient is φ = 17885280.

The previous prime is 78249553. The next prime is 78249583. The reversal of 78249570 is 7594287.

It is a super-2 number, since 2×78249570² = 12245990410369800, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25146 + ... + 28085.

It is an arithmetic number, because the mean of its divisors is an integer number (4551336).

Almost surely, 2^78249570 is an apocalyptic number.

78249570 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78249570 is an abundant number, since it is smaller than the sum of its proper divisors (140214558).

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

78249570 is a wasteful number, since it uses less digits than its factorization.

78249570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53255 (or 53248 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 78249570 is about 8845.8787014067. The cubic root of 78249570 is about 427.7210784968.

The spelling of 78249570 in words is "seventy-eight million, two hundred forty-nine thousand, five hundred seventy".