1552774978 has 32 divisors (see below), whose sum is σ = 2423329920. Its totient is φ = 745718400.

The previous prime is 1552774969. The next prime is 1552774991. The reversal of 1552774978 is 8794772551.

It is a super-2 number, since 2×1552774978² = 4822220264605800968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414926 + ... + 1416022.

It is an arithmetic number, because the mean of its divisors is an integer number (75729060).

Almost surely, 2^1552774978 is an apocalyptic number.

1552774978 is a deficient number, since it is larger than the sum of its proper divisors (870554942).

1552774978 is a wasteful number, since it uses less digits than its factorization.

1552774978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402.

The product of its digits is 4939200, while the sum is 55.

The square root of 1552774978 is about 39405.2658663788. The cubic root of 1552774978 is about 1157.9847535535.

The spelling of 1552774978 in words is "one billion, five hundred fifty-two million, seven hundred seventy-four thousand, nine hundred seventy-eight".