78771290 has 16 divisors (see below), whose sum is σ = 152695368. Its totient is φ = 29084736.

The previous prime is 78771289. The next prime is 78771311. The reversal of 78771290 is 9217787.

It can be written as a sum of positive squares in 4 ways, for example, as 52954729 + 25816561 = 7277^2 + 5081^2 .

It is a super-2 number, since 2×78771290² = 12409832256528200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302837 + ... + 303096.

Almost surely, 2^78771290 is an apocalyptic number.

78771290 is a deficient number, since it is larger than the sum of its proper divisors (73924078).

78771290 is a wasteful number, since it uses less digits than its factorization.

78771290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605953.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 78771290 is about 8875.3191491912. The cubic root of 78771290 is about 428.6695673138.

The spelling of 78771290 in words is "seventy-eight million, seven hundred seventy-one thousand, two hundred ninety".