1552367778 has 48 divisors (see below), whose sum is σ = 3378724608. Its totient is φ = 472680000.

The previous prime is 1552367777. The next prime is 1552367779. The reversal of 1552367778 is 8777632551.

It is an interprime number because it is at equal distance from previous prime (1552367777) and next prime (1552367779).

It is a self number, because there is not a number n which added to its sum of digits gives 1552367778.

It is not an unprimeable number, because it can be changed into a prime (1552367777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 794703 + ... + 796653.

It is an arithmetic number, because the mean of its divisors is an integer number (70390096).

Almost surely, 2^1552367778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1552367778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1689362304).

1552367778 is an abundant number, since it is smaller than the sum of its proper divisors (1826356830).

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

1552367778 is a wasteful number, since it uses less digits than its factorization.

1552367778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171 (or 2070 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 51.

The square root of 1552367778 is about 39400.0987054601. The cubic root of 1552367778 is about 1157.8835213247.

The spelling of 1552367778 in words is "one billion, five hundred fifty-two million, three hundred sixty-seven thousand, seven hundred seventy-eight".