78339490 has 16 divisors (see below), whose sum is σ = 141134400. Its totient is φ = 31308400.

The previous prime is 78339473. The next prime is 78339497. The reversal of 78339490 is 9493387.

It is a super-2 number, since 2×78339490² = 12274151386920200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78339497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11811 + ... + 17209.

It is an arithmetic number, because the mean of its divisors is an integer number (8820900).

Almost surely, 2^78339490 is an apocalyptic number.

78339490 is a deficient number, since it is larger than the sum of its proper divisors (62794910).

78339490 is a wasteful number, since it uses less digits than its factorization.

78339490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 78339490 is about 8850.9598349558. The cubic root of 78339490 is about 427.8848534394.

The spelling of 78339490 in words is "seventy-eight million, three hundred thirty-nine thousand, four hundred ninety".