78249735 has 24 divisors (see below), whose sum is σ = 140010624. Its totient is φ = 40386240.

The previous prime is 78249719. The next prime is 78249751. The reversal of 78249735 is 53794287.

It is an interprime number because it is at equal distance from previous prime (78249719) and next prime (78249751).

It is not a de Polignac number, because 78249735 - 2⁴ = 78249719 is a prime.

It is a super-2 number, since 2×78249735² = 12246042055140450, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 26652 + ... + 29441.

It is an arithmetic number, because the mean of its divisors is an integer number (5833776).

Almost surely, 2^78249735 is an apocalyptic number.

78249735 is a deficient number, since it is larger than the sum of its proper divisors (61760889).

78249735 is a wasteful number, since it uses less digits than its factorization.

78249735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56135 (or 56132 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 78249735 is about 8845.8880277788. Note that the first 3 decimals coincide. The cubic root of 78249735 is about 427.7213791329.

The spelling of 78249735 in words is "seventy-eight million, two hundred forty-nine thousand, seven hundred thirty-five".