400785064 has 32 divisors (see below), whose sum is σ = 797769000. Its totient is φ = 188108800.

The previous prime is 400785029. The next prime is 400785079. The reversal of 400785064 is 460587004.

It can be written as a sum of positive squares in 4 ways, for example, as 385808164 + 14976900 = 19642^2 + 3870^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 50862 + ... + 58210.

Almost surely, 2^400785064 is an apocalyptic number.

It is an amenable number.

400785064 is a deficient number, since it is larger than the sum of its proper divisors (396983936).

400785064 is a wasteful number, since it uses less digits than its factorization.

400785064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7773 (or 7769 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 400785064 is about 20019.6169793530. The cubic root of 400785064 is about 737.2880181330.

The spelling of 400785064 in words is "four hundred million, seven hundred eighty-five thousand, sixty-four".