1377407778 has 16 divisors (see below), whose sum is σ = 2806793856. Its totient is φ = 450472880.

The previous prime is 1377407761. The next prime is 1377407783. The reversal of 1377407778 is 8777047731.

It is a self number, because there is not a number n which added to its sum of digits gives 1377407778.

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, 2165418 + ... + 2166053.

It is an arithmetic number, because the mean of its divisors is an integer number (175424616).

Almost surely, 2^1377407778 is an apocalyptic number.

1377407778 is an abundant number, since it is smaller than the sum of its proper divisors (1429386078).

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

1377407778 is a wasteful number, since it uses less digits than its factorization.

1377407778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331529.

The product of its (nonzero) digits is 1613472, while the sum is 51.

The square root of 1377407778 is about 37113.4447067367. Note that the first 3 decimals coincide. The cubic root of 1377407778 is about 1112.6387395544.

The spelling of 1377407778 in words is "one billion, three hundred seventy-seven million, four hundred seven thousand, seven hundred seventy-eight".