155400780 has 24 divisors (see below), whose sum is σ = 435122352. Its totient is φ = 41440192.

The previous prime is 155400769. The next prime is 155400797. The reversal of 155400780 is 87004551.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1294947 + ... + 1295066.

It is an arithmetic number, because the mean of its divisors is an integer number (18130098).

Almost surely, 2^155400780 is an apocalyptic number.

155400780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155400780 is an abundant number, since it is smaller than the sum of its proper divisors (279721572).

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

155400780 is a wasteful number, since it uses less digits than its factorization.

155400780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590025 (or 2590023 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 155400780 is about 12465.9849189705. The cubic root of 155400780 is about 537.6311185440.

The spelling of 155400780 in words is "one hundred fifty-five million, four hundred thousand, seven hundred eighty".