78077490 has 32 divisors (see below), whose sum is σ = 188654400. Its totient is φ = 20679744.

The previous prime is 78077477. The next prime is 78077491. The reversal of 78077490 is 9477087.

It is not an unprimeable number, because it can be changed into a prime (78077491) 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, 4264 + ... + 13203.

It is an arithmetic number, because the mean of its divisors is an integer number (5895450).

Almost surely, 2^78077490 is an apocalyptic number.

78077490 is an abundant number, since it is smaller than the sum of its proper divisors (110576910).

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

78077490 is a wasteful number, since it uses less digits than its factorization.

78077490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17626.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 78077490 is about 8836.1467846568. The cubic root of 78077490 is about 427.4073120760.

The spelling of 78077490 in words is "seventy-eight million, seventy-seven thousand, four hundred ninety".