155978616 has 32 divisors (see below), whose sum is σ = 390902400. Its totient is φ = 51865440.

The previous prime is 155978597. The next prime is 155978633. The reversal of 155978616 is 616879551.

It is a congruent number.

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, 2301 + ... + 17811.

It is an arithmetic number, because the mean of its divisors is an integer number (12215700).

Almost surely, 2^155978616 is an apocalyptic number.

It is an amenable number.

155978616 is an abundant number, since it is smaller than the sum of its proper divisors (234923784).

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

155978616 is a wasteful number, since it uses less digits than its factorization.

155978616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15939 (or 15935 counting only the distinct ones).

The product of its digits is 453600, while the sum is 48.

The square root of 155978616 is about 12489.1399223485. The cubic root of 155978616 is about 538.2966629440.

The spelling of 155978616 in words is "one hundred fifty-five million, nine hundred seventy-eight thousand, six hundred sixteen".