78249351 has 16 divisors (see below), whose sum is σ = 110872800. Its totient is φ = 49088384.

The previous prime is 78249349. The next prime is 78249371. The reversal of 78249351 is 15394287.

It is not a de Polignac number, because 78249351 - 2¹ = 78249349 is a prime.

It is a super-2 number, since 2×78249351² = 12245921863842402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78249371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12085 + ... + 17393.

It is an arithmetic number, because the mean of its divisors is an integer number (6929550).

Almost surely, 2^78249351 is an apocalyptic number.

78249351 is a deficient number, since it is larger than the sum of its proper divisors (32623449).

78249351 is an equidigital number, since it uses as much as digits as its factorization.

78249351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5363 (or 5329 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 78249351 is about 8845.8663227521. The cubic root of 78249351 is about 427.7206794701.

The spelling of 78249351 in words is "seventy-eight million, two hundred forty-nine thousand, three hundred fifty-one".